Opened 10 years ago
Closed 10 years ago
#12412 closed defect (fixed)
TypeError when creating a zero map from a zero dimensional vector space to a positive dimensional vector space
Reported by: | JStarx | Owned by: | AlexGhitza |
---|---|---|---|
Priority: | major | Milestone: | sage-5.0 |
Component: | algebra | Keywords: | |
Cc: | Merged in: | sage-5.0.beta3 | |
Authors: | Jim Stark | Reviewers: | Aly Deines |
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
sage: V = GF(3)^0 sage: W = GF(3)^1 sage: H = V.Hom(W) sage: H.zero_element() ERROR: An unexpected error occurred while tokenizing input The following traceback may be corrupted or invalid The error message is: ('EOF in multi-line statement', (398, 0)) --------------------------------------------------------------------------- TypeError Traceback (most recent call last)
[snip]
/Users/Starx/sage/local/lib/python2.6/site-packages/sage/categories/modules.pyc in zero(self) 205 True 206 """ --> 207 return self(lambda x: self.codomain().zero()) 208 209 class EndCategory(HomCategory): /Users/Starx/sage/local/lib/python2.6/site-packages/sage/modules/vector_space_homspace.pyc in __call__(self, A, check) 383 msg = 'vector space homspace can only coerce matrices, vector space morphisms, functions or lists, not {0}' 384 raise TypeError(msg.format(A)) --> 385 return vector_space_morphism.VectorSpaceMorphism(self, A) 386 387 def _repr_(self): /Users/Starx/sage/local/lib/python2.6/site-packages/sage/modules/vector_space_morphism.pyc in __init__(self, homspace, A) 861 raise TypeError('domain dimension is incompatible with matrix size') 862 if homspace.codomain().dimension() != A.ncols(): --> 863 raise TypeError('codomain dimension is incompatible with matrix size') 864 865 A = homspace._matrix_space()(A) TypeError: codomain dimension is incompatible with matrix size
The problem here is that sage creates a list of lists from that lambda function and then a matrix from those lists, so the list of lists results in a 0x0 matrix instead of a 0x1 matrix. The fix is to just add the dimensions to the matrix constructor in vector_space_homspace.py, I will post a patch shortly.
Attachments (1)
Change History (4)
Changed 10 years ago by
comment:1 Changed 10 years ago by
- Status changed from new to needs_review
comment:2 Changed 10 years ago by
- Reviewers set to Aly Deines
- Status changed from needs_review to positive_review
comment:3 Changed 10 years ago by
- Merged in set to sage-5.0.beta3
- Resolution set to fixed
- Status changed from positive_review to closed
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