Opened 4 years ago
Closed 4 years ago
#18929 closed enhancement (fixed)
Include igraph library
Reported by:  borassi  Owned by:  

Priority:  major  Milestone:  sage6.9 
Component:  packages: optional  Keywords:  igraph library 
Cc:  ncohen, dcoudert, vbraun  Merged in:  
Authors:  Michele Borassi  Reviewers:  Nathann Cohen, David Coudert 
Report Upstream:  N/A  Work issues:  
Branch:  c4685c5 (Commits)  Commit:  c4685c504bc1603e44b3493213c7545baf415497 
Dependencies:  Stopgaps: 
Description (last modified by )
Include igraph library ![1] in Sagemath, so that we can use its algorithms. Add routines to convert Sage graphs into igraph and viceversa. The input files are available through the following links:
 for igraph.tar.gz: igraph.org/nightly/get/c/igraph0.7.1.tar.gz
 for pythonigraph.tar.gz: igraph.org/nightly/get/python/pythonigraph0.7.0.tar.gz
The modified files (with script spkg_src) are available through the following links:
 for igraph.tar.gz (the same as the previous one): https://drive.google.com/file/d/0B5D_YOccuV6xNFFUYnZFYzg0bkk/view?usp=sharing
 for pythonigraph.tar.gz (we had to replace  with _ in the filename and in a folder): https://drive.google.com/file/d/0B5D_YOccuV6xcURsT1BpLUpqZ0E/view?usp=sharing
If we manage to include igraph, we will have access to 62 algorithms on graphs: 29 of them are not available in Sage, yet ![2].
![1]http://igraph.org/python/
![2] https://docs.google.com/spreadsheets/d/1Iu1hkQtRn9JsgfZbQTu2RoXzyjoMEWP5cm3nAwnWE/edit#gid=0
Change History (45)
comment:1 Changed 4 years ago by
 Cc ncohen dcoudert vbraun added
 Component changed from PLEASE CHANGE to packages: optional
 Description modified (diff)
 Keywords igraph library added
 Status changed from new to needs_info
 Type changed from PLEASE CHANGE to enhancement
comment:2 Changed 4 years ago by
 Branch set to u/borassi/include_igraph_library
comment:3 Changed 4 years ago by
 Commit set to 388abfbfec5b9d8255ff83efbdfc4a61a076ffce
Branch pushed to git repo; I updated commit sha1. New commits:
388abfb  Modified spkgsrc according to Nathann's suggestions.

comment:4 Changed 4 years ago by
 Status changed from needs_info to needs_review
Hello!
I have modified spkgsrc
, taking inspiration from the spkgsrc
file of bzip2
in ticket #18826. I have added the dependencies, but I'm not really sure if I have done it correctly (I have no idea of where variable $(IGRAPH)
is defined).
Thank you very much!
Michele
comment:5 Changed 4 years ago by
 Status changed from needs_review to needs_work
Helloooooooo Michele,
I have not installed the two igraph packages yet (the reason will follow) but it seems that you did well with the 'dependencies' file. The 'IGRAPH' variable is a bit magic it's true: it is generated from the package's name, and you should find it in SAGE_ROOT/build/make/Makefile
somewhere. If you look for PYTHON_IGRAPH
you should see the dependency that you added in this 'dependencies' file.
I added a small commit at public/18929
that does not do anything smart. I flagged the new doctests with # optional  python_igraph
so that they are only run if the python_igraph
is installed (they would break otherwise), though there remains some problem to deal with: you cannot import 'igraph' in the (Di)Graph constructor, for this package is optional. I ran the tests before installing the package, and well.. Everything break. Even this:
sage: Graph() ... ImportError: No module named igraph
Sooo perhaps you should 'detect' the presence of this module with something like that (unless you find something better):
try: import igraph _python_igraph_available = True except ImportError: _python_igraph_available = False
In the same way, your 'import igraph' in GenericGraph.igraph_graph
would generate, when called on a machine on which the package is not installed, an ImportError
. We usually try to give something easier to work with, like an error message advising to install a package named <package_name> to enable this feature.
Have fuuuuuuun,
Nathann
comment:6 Changed 4 years ago by
 Commit changed from 388abfbfec5b9d8255ff83efbdfc4a61a076ffce to 1ca4c05f87ac4bc0637982b53521e723f96f2071
comment:7 Changed 4 years ago by
Hellooooooooooo!
Ups, you were right: if igraph is not installed, nothing works anymore. I have corrected it, and I have included your commit (we both merged with 6.8...).
Now everything should work (I have performed a test of all the graph part, and all tests were passed).
See you, Michele
comment:8 Changed 4 years ago by
Hello again Michele,
I was about to try to install the two packages and so I downloaded igraph's sources, but it seems that there is something wrong with the checksums:
(tmp✔)~/.Sage$ sage i igraph Found local metadata for igraph0.7.1 Invalid checksum for cached file /home/ncohen/.Sage/upstream/igraph0.7.1.tar.gz, deleting
Could you also provide direct links toward the archive files in the ticket's description? This is for the release manager who will have to add them to Sage's repository.
In the second case, i.e. the python_igraph
file (as it is not vanilla upstream), it means uploading it on some server of yours so that it can be downloaded from there. The purpose of ticket #18826 is precisely to give us an easy way to 'check', in such situations, that the archive uploaded by one of us is exactly what it should.
Nathann
comment:9 Changed 4 years ago by
Oh, and something else I forgot: it is not sufficient to add the edges in order to get the graph: isolated vertices would not appear in this case.
Nathann
comment:10 Changed 4 years ago by
 Description modified (diff)
 Status changed from needs_work to needs_review
Hello!
I have done it: sorry, but I'm not very experienced with new packages, so I need lots of advices and comments, even to solve stupid issues...
Michele
comment:11 Changed 4 years ago by
 Commit changed from 1ca4c05f87ac4bc0637982b53521e723f96f2071 to ac2c5c39a65c1ef8e003219bf59fc9f6e35f61e1
Branch pushed to git repo; I updated commit sha1. New commits:
ac2c5c3  Solved a problem with isolated vertices

comment:12 followup: ↓ 14 Changed 4 years ago by
Hello again Michele,
Don't worry about the many steps it takes to get this through. I also worry that I may be a bit boring, with all these things I add one by one to your stack because I cannot seem to figure out them all at the same time.
I installed the two packages, and things went well. I still have a question about the igraph package: upstream is apparently a 'fake' .tar.gz archive (it is not gzipped) > is this why your igraph package is 'not exactly' (up to md5sum hash) equal to upstream?
While looking at the (Di)Graph constructor, I thought that something unlikely may happen: 1) Somebody has a igraph object in a Sage session 2) igraph is not installed in Sage I thought that it could happen if by some chance such an object was obtained through pickling.
Perhaps it sounds stupid. This being said, I also 'fixed' something else: importing modules is not totally free, and it was even the bottleneck in some design code I met in the past. For this reason, it is better to not import things in potentially critical parts of the code (the graph constructor can be one of those, for instance when you enumerate graphs up to isomorphism) and so I tried to make it less frequent. This commit is located at public/18929
, you can take/remove what you like/do not like in it.
Have you figured out this GPL2 vs GPLv2+ issue I mentionned in an email?
Byeeeeeeeeeee,
Nathann
P.S.: I had some issue when installing the package, which I reported upstream (https://github.com/igraph/igraph/issues/842)
comment:13 Changed 4 years ago by
 Status changed from needs_review to needs_info
comment:14 in reply to: ↑ 12 ; followup: ↓ 16 Changed 4 years ago by
Hello!
Replying to ncohen:
Hello again Michele,
Don't worry about the many steps it takes to get this through. I also worry that I may be a bit boring, with all these things I add one by one to your stack because I cannot seem to figure out them all at the same time.
I installed the two packages, and things went well. I still have a question about the igraph package: upstream is apparently a 'fake' .tar.gz archive (it is not gzipped) > is this why your igraph package is 'not exactly' (up to md5sum hash) equal to upstream?
What do you mean by 'fake' .tar.gz archive? Anyway, I have downloaded again the file igraph.tar.gz, and I have run again the sage sh sagefixpkgchecksums
script, hoping it will solve the problem. Does it?
While looking at the (Di)Graph constructor, I thought that something unlikely may happen: 1) Somebody has a igraph object in a Sage session 2) igraph is not installed in Sage I thought that it could happen if by some chance such an object was obtained through pickling.
Perhaps it sounds stupid. This being said, I also 'fixed' something else: importing modules is not totally free, and it was even the bottleneck in some design code I met in the past. For this reason, it is better to not import things in potentially critical parts of the code (the graph constructor can be one of those, for instance when you enumerate graphs up to isomorphism) and so I tried to make it less frequent. This commit is located at
public/18929
, you can take/remove what you like/do not like in it.
I have included the commit.
Have you figured out this GPL2 vs GPLv2+ issue I mentionned in an email?
The igraph file COPYING that comes with both packages starts with:
GNU GENERAL PUBLIC LICENSE Version 2, June 1991
So I believe it is GPLv2. However, it does not seem to be a problem: http://www.gnu.org/licenses/gplfaq.en.html#WhatDoesCompatMean. Moreover, also package latte_int is distributed with Sage with GPLv2.
Byeeeeeeeeeee,
Nathann
P.S.: I had some issue when installing the package, which I reported upstream (https://github.com/igraph/igraph/issues/842)
Ouch, yes, the problem is libxml2. I have uninstalled it from my computer, and I have reinstalled igraph (without Sage): the problem still appears, even if ./configure realizes that libxml2 is missing, because it writes "GraphML format support  no". Probably it is an igraph bug.
In order to solve this problem, I have added a check in the spkginstall script, and I had to modify the sagespkg file to allow an error which depends on the user. Do you agree with this modification? Or do you think I should do something less "invasive"? Because I do not like that we tell the user to contact sagedevel if (s)he only has to install libxml2.
comment:15 Changed 4 years ago by
 Commit changed from ac2c5c39a65c1ef8e003219bf59fc9f6e35f61e1 to d6770f994d05bc9443445fbdeedd2a8215806077
comment:16 in reply to: ↑ 14 ; followup: ↓ 18 Changed 4 years ago by
Hello,
What do you mean by 'fake' .tar.gz archive?
Sigh.... After some debugging, it seems that if I click on "source code" at this address (http://igraph.org/c/#downloads) I get a file like that:
~$ file igraph0.7.1.tar.gz igraph0.7.1.tar.gz: POSIX tar archive
If I copy/paste the url and download it with wget I get a file like that:
~$ file igraph0.7.1.tar.gz igraph0.7.1.tar.gz: gzip compressed data, last modified: Tue Apr 22 19:55:20 2014, max compression, from Unix
Anyway. It works, sorry for the misunderstanding.
So I believe it is GPLv2. However, it does not seem to be a problem: http://www.gnu.org/licenses/gplfaq.en.html#WhatDoesCompatMean. Moreover, also package latte_int is distributed with Sage with GPLv2.
Yes yes you are right. It would have been a problem for a standard package, but of course not for an optional one.
In order to solve this problem, I have added a check in the spkginstall script, and I had to modify the sagespkg file to allow an error which depends on the user. Do you agree with this modification?
Oh. Well, I did not want to say that it had to be modified on our side. I merely wanted to tell you what had happened and that it had been reported upstream. For me it is not a very important problem, and for as long as upstream knows and fixes it I do not think that we should care O_o
Nathann
comment:17 Changed 4 years ago by
 Commit changed from d6770f994d05bc9443445fbdeedd2a8215806077 to d060ccbddf96281324e021e49b6e20758a01cb26
Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:
61f72f3  Included igraph in sage.

222c2dc  Conversion Sage graphs  igraph graphs

83b5970  Small correction in the documentation

e09511f  Modified spkgsrc according to Nathann's suggestions.

59098e6  trac #18929: Reviewer's commit

acd870b  Solved bug if igraph is not installed

20ca006  Solved a problem with isolated vertices

36f998a  trac #18929: Reviewer's commit

fa916b4  Included Nathann's work

d060ccb  Check that libxml2 is installed

comment:18 in reply to: ↑ 16 Changed 4 years ago by
In order to solve this problem, I have added a check in the spkginstall script, and I had to modify the sagespkg file to allow an error which depends on the user. Do you agree with this modification?
Oh. Well, I did not want to say that it had to be modified on our side. I merely wanted to tell you what had happened and that it had been reported upstream. For me it is not a very important problem, and for as long as upstream knows and fixes it I do not think that we should care
O_o
Ok, I went back to the previous version: if it is not installed, an error explaining the problem is raised before any installation.
comment:19 Changed 4 years ago by
 Reviewers set to Nathann Cohen
 Status changed from needs_info to positive_review
Okayyyyyy, good !
Nathann
comment:20 Changed 4 years ago by
 Status changed from positive_review to needs_work
Wait a second: I was trying to make a better interface, that takes into account vertex/edge labels and weight... To be uploaded soon!
comment:21 Changed 4 years ago by
 Commit changed from d060ccbddf96281324e021e49b6e20758a01cb26 to facc0faa1906a9f5744de908915163aab575722a
Branch pushed to git repo; I updated commit sha1. New commits:
facc0fa  Conversion of graph name, edge labels, vertex name, and edge weight

comment:23 Changed 4 years ago by
 Commit changed from facc0faa1906a9f5744de908915163aab575722a to b5c421f1902bb9c41a01d1359d1fc0c2407f4e5f
Branch pushed to git repo; I updated commit sha1. New commits:
b5c421f  Removed trailing whitespaces

comment:24 Changed 4 years ago by
 Commit changed from b5c421f1902bb9c41a01d1359d1fc0c2407f4e5f to 24920b6ffa69b6e92efabf359970a96464912d8e
comment:25 followup: ↓ 26 Changed 4 years ago by
Helooooooo Michele,
I finished reviewing this ticket again. I'm sorry but if there is one thing I cannot stand, it is to see heaps of code meant to deal with edge labels/multile edges/loops/weights. Dozens of line which do nothing but wrap junk into another kind of junk.
Well.
I added a commit at public/18929 which does the following modifications, which you can of course accept/discuss/reject:
 documentation of
igraph
input  I removed the end of the sentence about what is done with weights/names/etc. It is not said for other formats and it is how it is expected to work. I thought that the shortest was the best.
 removed some trailing whitespaces
 changed the message in which you mentionned a 'network'. Graphs are.. Well, nobody exactly knows. Depending on who you talk to, when you say "a graph" people hear "social network graph", "router graph", "planar graph", "vertextransitive graph", "cayley graph", and many others. Networks do exist, but that would not make *any* sense for some of those guys, so I stuck to the 'graph' terminology.
 I "compressed" a bit the copy/paste meant to handle names, by using the relabel function. For this I had to change a line in
GenericGraph.relabel
related to_boundary
, but this#O&O#&&^@)#%*(
is meant to be removed in #17462 anyway.
 Try to not use
except Exception
if you can avoid it. That's too large. If there is a typo in the line before it, it will catch this too and you don't want that. Also, try to keep as little as possible in a try/except.
Finally, I have to say that I can't bring myself to give a positive review to this latest commit. Much of what it does is, to me, meant to be done by the user. We cannot adapt to the many forms he wants his data to take in the igraph graph, so I think that the best we should do is ... "keep it simple and reliable". Guessing that 'label' is a special key in the dictionary is (to me) going way too far, and I am tempted to do the same for weights. Of course their labels *have* to be dictionaries and ours can be anything. That's unpleasant, but turning our label into a {'label':label}
in their data structure, and setting their dictionary to be our edge label is to me the best we can do.
So yes, if you apply translation several times you will not converge. Honestly, I do not care at all.
Sooooo, sorry for that. You have several ways out:
 Get this ticket reviewed by somebody else (I will not force my view, I just won't review it myself  no way)
 Remove the commits you added since my last 'positive review' so that this ticket can get merged, and move those label commits to another ticket.
As you wish.
Have fun,
Nathann
comment:26 in reply to: ↑ 25 Changed 4 years ago by
Hellooooooo!
Well, I go for a variation of the first solution you proposed: simplifying as much as possible the interface with igraph. In particular, I have removed the graph name, and vertex and edge attributes are provided by the user in "igraphstyle" (http://igraph.org/python/doc/igraph.Graphclass.html#__init__). There are several examples on how to do it in my new code.
For the igraph=>sage conversion, I have used your relabel function for vertex names, while the edge label is simply kept as it was in igraph (only problem: empty labels in igraph translate to {}
label in Sage, not to None
).
More answers below! Hope you like this new commit!
See you,
Michele
Replying to ncohen:
Helooooooo Michele,
I finished reviewing this ticket again. I'm sorry but if there is one thing I cannot stand, it is to see heaps of code meant to deal with edge labels/multile edges/loops/weights. Dozens of line which do nothing but wrap junk into another kind of junk.
Well.
I added a commit at public/18929 which does the following modifications, which you can of course accept/discuss/reject:
 documentation of
igraph
input  I removed the end of the sentence about what is done with weights/names/etc. It is not said for other formats and it is how it is expected to work. I thought that the shortest was the best.
Accept
 removed some trailing whitespaces
Accept
 changed the message in which you mentionned a 'network'. Graphs are.. Well, nobody exactly knows. Depending on who you talk to, when you say "a graph" people hear "social network graph", "router graph", "planar graph", "vertextransitive graph", "cayley graph", and many others. Networks do exist, but that would not make *any* sense for some of those guys, so I stuck to the 'graph' terminology.
Accept
 I "compressed" a bit the copy/paste meant to handle names, by using the relabel function. For this I had to change a line in
GenericGraph.relabel
related to_boundary
, but this#O&O#&&^@)#%*(
is meant to be removed in #17462 anyway.
Accept
 Try to not use
except Exception
if you can avoid it. That's too large. If there is a typo in the line before it, it will catch this too and you don't want that. Also, try to keep as little as possible in a try/except.
Accept (modified also in the digraph file)
Finally, I have to say that I can't bring myself to give a positive review to this latest commit. Much of what it does is, to me, meant to be done by the user. We cannot adapt to the many forms he wants his data to take in the igraph graph, so I think that the best we should do is ... "keep it simple and reliable". Guessing that 'label' is a special key in the dictionary is (to me) going way too far, and I am tempted to do the same for weights. Of course their labels *have* to be dictionaries and ours can be anything. That's unpleasant, but turning our label into a
{'label':label}
in their data structure, and setting their dictionary to be our edge label is to me the best we can do.
Unfortunately, I don't think so. The problem occurs if we want to convert weighted graphs (and some of the algorithms we want to "steal" are on weighted graph). Indeed, an igraph graph is weighted if edges contain an attribute 'weight', and with this conversion there is no way to obtain that. My solution is to let the user provide the labels.
So yes, if you apply translation several times you will not converge. Honestly, I do not care at all.
Now, if the starting graph has "igraphfriendly" labels and the user provides the right attributes, it converges (see the examples).
Sooooo, sorry for that. You have several ways out:
 Get this ticket reviewed by somebody else (I will not force my view, I just won't review it myself  no way)
 Remove the commits you added since my last 'positive review' so that this ticket can get merged, and move those label commits to another ticket.
As you wish.
Have fun,
Nathann
comment:27 Changed 4 years ago by
 Commit changed from 24920b6ffa69b6e92efabf359970a96464912d8e to fc693a955362964e4c7bb73c75b74c65e7dbebef
comment:28 Changed 4 years ago by
Hello,
I tried to install igraph and more precisely ./sage i python_igraph
but I have checksum error. What should I do?
David.
comment:29 Changed 4 years ago by
Did you follow the whole procedure to install igraph? In particular, you should do the following:
 Download the two .tar.gz source code files [1,2] and put them in folder
SAGE_ROOT/upstream
(this folder is not synchronized with git).  run the script
SAGE_ROOT/build/pkgs/python_igraph/spkgsrc
throughsage sh ./build/pkgs/python_igraph/spkgsrc
from folderSAGE_ROOT
(you can also run it from any other folder).
Another possible procedure is to download the modified tarballs from [3,4] and put them in the folder SAGE_ROOT/upstream
. Then, ./sage i python_igraph
should work.
If you still have problems, could you tell me which of the two procedure fails, and if it still fails after running the command sage sh sagefixpkgchecksums
?
Thank you very much,
Michele
![1] http://igraph.org/c/#downloads!
![2] http://igraph.org/python/#downloads
![3] https://drive.google.com/file/d/0B5D_YOccuV6xNFFUYnZFYzg0bkk/view?usp=sharing
![4] https://drive.google.com/file/d/0B5D_YOccuV6xcURsT1BpLUpqZ0E/view?usp=sharing
comment:30 followups: ↓ 31 ↓ 36 Changed 4 years ago by
My first trial was with the source code from [1] and [2].
One difficulty is that [2] gives pythonigraph...
and not python_igraph...
Now I'm trying with [4] and it's working... but then it says that igraph is not installed.
So I'm running ./sage i igraph
using the source code from [3] (should work also with [1]).
The point is that before installing igraph, I installed this patch and performed the following test:
sage: G = graphs.PetersenGraph() sage: G.igraph_graph()  ImportError Traceback (most recent call last) <ipythoninput207a5568607db> in <module>() > 1 G.igraph_graph() /Users/dcoudert/sage/local/lib/python2.7/sitepackages/sage/graphs/generic_graph.pyc in igraph_graph(self, vertex_attrs, edge_attrs) 1432 raise ImportError("The package igraph is not available. To " + 1433 "install it, run Sage with option i " + > 1434 "python_igraph.") 1435 1436 v_to_int = {v:i for i,v in enumerate(self.vertices())} ImportError: The package igraph is not available. To install it, run Sage with option i python_igraph. sage:
I don't know if the installation of python_igraph
is expected to install igraph
as well or not. If not, then the error message should be improved.
Now that it is working, I did
sage: G = graphs.PetersenGraph() sage: H = G.igraph_graph() sage: H.<TAB>
and got access to the list of methods.
It is surprizing to see that we have both graph algorithms and graph generators (e.g. Barabasi
, Erdos_Renyi
, etc.), but I assume there is nothing you can do to avoid that. Not a big deal.
Also, some methods for digraphs (e.g., all_st_mincuts
) are accessible from undirected graphs and so an error is raised, but again I assume there is nothing we can do about it.
sage: H.is_directed() False sage: H.all_st_mincuts(0,2)  NotImplementedError Traceback (most recent call last) <ipythoninput228251331c5c90> in <module>() > 1 H.all_st_mincuts(Integer(0),Integer(2)) /Users/dcoudert/sage/local/lib/python2.7/sitepackages/python_igraph0.7.0py2.7macosx10.9x86_64.egg/igraph/__init__.pyc in all_st_mincuts(self, source, target, capacity) 390 graphs. Algorithmica 15, 351372, 1996. 391 """ > 392 value, cuts, parts = GraphBase.all_st_mincuts(self, source, target, capacity) 393 return [Cut(self, value, cut=cut, partition=part) 394 for cut, part in izip(cuts, parts)] NotImplementedError: Error at stcuts.c:1320: St cuts can only be listed in directed graphs, Unimplemented function call
Anyway, its working.
I will now try to understand the point of disagreement between you and Nathann.
David.
comment:31 in reply to: ↑ 30 ; followup: ↓ 35 Changed 4 years ago by
Replying to dcoudert:
My first trial was with the source code from [1] and [2]. One difficulty is that [2] gives
pythonigraph...
and notpython_igraph...
This is exactly the reason why I made the spkgsrc
script (Sage cannot install packages with dashes inside their names).
Now I'm trying with [4] and it's working... but then it says that igraph is not installed. So I'm running
./sage i igraph
using the source code from [3] (should work also with [1]).The point is that before installing igraph, I installed this patch and performed the following test:
sage: G = graphs.[wiki:PetersenGraph]() sage: G.igraph_graph()  ImportError Traceback (most recent call last) <ipythoninput207a5568607db> in <module>() > 1 G.igraph_graph() /Users/dcoudert/sage/local/lib/python2.7/sitepackages/sage/graphs/generic_graph.pyc in igraph_graph(self, vertex_attrs, edge_attrs) 1432 raise ImportError("The package igraph is not available. To " + 1433 "install it, run Sage with option i " + > 1434 "python_igraph.") 1435 1436 v_to_int = {v:i for i,v in enumerate(self.vertices())} ImportError: The package igraph is not available. To install it, run Sage with option i python_igraph. sage:I don't know if the installation of
python_igraph
is expected to installigraph
as well or not. If not, then the error message should be improved.
Hmmmmm, good question. I added igraph to the dependencies of python_igraph, but maybe it is not sufficient (see comments 45)... Nathann??
Now that it is working, I did
sage: G = graphs.[wiki:PetersenGraph]() sage: H = G.igraph_graph() sage: H.<TAB>and got access to the list of methods. It is surprizing to see that we have both graph algorithms and graph generators (e.g.
Barabasi
,Erdos_Renyi
, etc.), but I assume there is nothing you can do to avoid that. Not a big deal. Also, some methods for digraphs (e.g.,all_st_mincuts
) are accessible from undirected graphs and so an error is raised, but again I assume there is nothing we can do about it.sage: H.is_directed() False sage: H.all_st_mincuts(0,2)  NotImplementedError Traceback (most recent call last) <ipythoninput228251331c5c90> in <module>() > 1 H.all_st_mincuts(Integer(0),Integer(2)) /Users/dcoudert/sage/local/lib/python2.7/sitepackages/python_igraph0.7.0py2.7macosx10.9x86_64.egg/igraph/__init__.pyc in all_st_mincuts(self, source, target, capacity) 390 graphs. Algorithmica 15, 351372, 1996. 391 """ > 392 value, cuts, parts = GraphBase.all_st_mincuts(self, source, target, capacity) 393 return [Cut(self, value, cut=cut, partition=part) 394 for cut, part in izip(cuts, parts)] NotImplementedError: Error at stcuts.c:1320: St cuts can only be listed in directed graphs, Unimplemented function callAnyway, its working.
I will now try to understand the point of disagreement between you and Nathann.
David.
comment:32 followup: ↓ 34 Changed 4 years ago by
could you resolve the merge conflict with last beta (beta1). Thanks.
comment:33 Changed 4 years ago by
 Commit changed from fc693a955362964e4c7bb73c75b74c65e7dbebef to 93dee5e3d8e20b2fd19da57644f0f67e645171de
Branch pushed to git repo; I updated commit sha1. New commits:
93dee5e  Merged with beta1

comment:34 in reply to: ↑ 32 Changed 4 years ago by
could you resolve the merge conflict with last beta (beta1). Thanks.
Done!
comment:35 in reply to: ↑ 31 Changed 4 years ago by
Hmmmmm, good question. I added igraph to the dependencies of python_igraph, but maybe it is not sufficient (see comments 45)... Nathann??
Yeah, I know. The dependency is taken into consideration only if you install the package by typing 'make python_igraph'. It is ignored if you run 'sage i python_igraph'. Why? Because Jeroen likes it.
I think that it is plainly stupid, and already had to complain on a ticket (#18859) which replaced *all* instructions to install a package through "sage i <pkgname>" with "make <pkgname>" (which is obviously less practical for beginners).
To me, the 'most natural' command for users (i.e. 'sage i pkgname') should install the package, and take dependencies into account.
If you agree with Jeroen you have nothing to do, if you do not care you have nothing to do, if you have any other opinion please voice it on sagedevel, or nothing will happen.
Nathann
comment:36 in reply to: ↑ 30 Changed 4 years ago by
I will now try to understand the point of disagreement between you and Nathann.
There is none anymore. If you are satisfied with this patch, then it is 'positively reviewed' and can make it in.
Nathann
comment:37 followup: ↓ 39 Changed 4 years ago by
 Milestone changed from sage6.8 to sage6.9
Hello,
I thought these two lines were removed from graph.py
and digraph.py
in #17462, but I see them in your commits...
 ``boundary``  a list of boundary vertices, if empty, graph is considered as a 'graph without boundary'
David.
comment:38 Changed 4 years ago by
 Commit changed from 93dee5e3d8e20b2fd19da57644f0f67e645171de to 655943e1481a7f80fc60f9f26529c8a7c1e64216
Branch pushed to git repo; I updated commit sha1. New commits:
655943e  Corrected merge error

comment:39 in reply to: ↑ 37 Changed 4 years ago by
Sorry, wrong merge... Now it should be correct!
comment:40 Changed 4 years ago by
 Reviewers changed from Nathann Cohen to Nathann Cohen, David Coudert
 Status changed from needs_review to positive_review
One last thing: in the doc of the igraph_graph
method, you should mention explicitely that it requires the optional package python_igraph
.
It does not appear on html page sage/src/doc/output/html/en/reference/graphs/sage/graphs/generic_graph.html#sage.graphs.generic_graph.GenericGraph.igraph_graph
comment:41 Changed 4 years ago by
 Status changed from positive_review to needs_work
sorry... needs work for the doc ;)
comment:42 Changed 4 years ago by
 Commit changed from 655943e1481a7f80fc60f9f26529c8a7c1e64216 to c4685c504bc1603e44b3493213c7545baf415497
Branch pushed to git repo; I updated commit sha1. New commits:
c4685c5  Corrected doc and error message if igraph is not installed

comment:43 Changed 4 years ago by
Done, and I have also modified the error message if python_igraph is not installed.
comment:45 Changed 4 years ago by
 Branch changed from u/borassi/include_igraph_library to c4685c504bc1603e44b3493213c7545baf415497
 Resolution set to fixed
 Status changed from positive_review to closed
Hello!
With this ticket, I would like to add igraph library to Sage. I have tried to follow as much as possible the instructions in ![1], to include the following external libraries:
In order to build this code, you should do the following.
SAGE_ROOT/upstream
(this folder is not synchronized with git).SAGE_ROOT/build/pkgs/python_igraph/spkgsrc
from folderSAGE_ROOT
, with command./build/pkgs/python_igraph/spkgsrc
. The problem is that Sage does not like dashes inside the package name: the script converts the filepythonigraph0.7.0.tar.gz
intopython_igraph0.7.0.gz
(it is also necessary to modify the name of a folder inside the tar archive).I am not really sure about the procedure (in particular, about
spkgsrc
), so I would like to have feedback, also related to ticket #18826.Thank you very much!
Michele
![1] doc.sagemath.org/html/en/developer/packaging.html
![2] http://igraph.org/c/#downloads![3] http://igraph.org/python/#downloads