[with package and patches, positive review] update to pynac 0.1.6

[burcin]

There is a new version of pynac with the following changes:

• Change printing of pi (Pi -> pi)
• Delay evaluation of special functions until .evalf() is called
• Add precision parameter to .evalf()

I am opening a new ticket, since the patches require separate review.

The package is here:

​http://sage.math.washington.edu/home/burcin/pynac/pynac-0.1.5.spkg

Attached patches need to be applied to Sage, they depend on #5753.

I got an infinite loop trying to convert to ComplexField in the second patch, hence the additions to sage/rings/complex_field.py. Robert, am I doing something wrong here?

[burcin]

fix doctests for printing changes

[burcin]

allow setting precision for numerical approximation

[burcin]

Rebased attachment:trac_5777-02-precision.patch​ for 3.4.1.

[burcin]

add doctests for exceptions raised during hashing

[burcin]

support pickling pynac expressions

[burcin]

support pickling symbolic functions

[burcin]

doctests for the changes in behavior of exp

[burcin]

I put a preliminary version of the new pynac package here:

​http://sage.math.washington.edu/home/burcin/pynac/pynac-0.1.6.spkg

I haven't actually committed the version information to the pynac repository yet. I plan to wait until this gets reviewed, and see if there are any last minute changes needed.

The newly uploaded patches:

• attachment:trac_5777-11-hash_doctests.patch​
• attachment:trac_5777-12-pickle_expression.patch​
• attachment:trac_5777-13-pickle_sfunction.patch​
• attachment:trac_5777-14-exp.patch​

correspond to the changes in the new package.

The changes in pynac are:

• Fix error handling in Number_T::hash().
• Add support for archiving numeric and function objects.
• Fix comparison bug in mul.
• Fix gcc warnings about conversion of strings to char*.
• Change exp to not prints exponents of 1.
• Add power method to exp so that (e^x)^y -> e^(x*y).

Note that this fixes #5944, which I consider a blocker.

[mhansen]

I have all of Burcin's changes that apply to 4.0.rc0 in symbolics_final1.patch. These work with the pynac-0.1.6.spkg.

These get a positive review from me. I've based the new symbolics changes on these.

[mabshoff]

Merged in Sage 4.0.rc0.

Cheers,

Michael