#18979: avoid Maxima on creation of symbolic matrices
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Reporter: rws | Owner:
Type: | Status: needs_work
defect | Milestone: sage-6.9
Priority: major | Resolution:
Component: | Merged in:
linear algebra | Reviewers:
Keywords: | Work issues:
Authors: Nils | Commit:
Bruin | 257c0df6820e80995cc7be08f7d9c64e8fdfbca7
Report Upstream: N/A | Stopgaps:
Branch: |
u/nbruin/18979 |
Dependencies: |
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Changes (by vdelecroix):
* status: needs_review => needs_work
Comment:
As I said in [comment:5 comment:5], the solution should be non intrusive
and your solution is what I suggested at the very end of this comment.
Though, using a list extension is twice slower. With
{{{
def m1():
cdef Py_ssize_t i
cdef list l = [0] * 100
for i in range(10): l[10*i + i] = 12
return l
def m2():
cdef Py_ssize_t i,j
return [12 if i == j else 0 for i in range(10) for j in range(10)]
}}}
I got
{{{
sage: %runfile test.pyx
sage: %timeit l = m1()
1000000 loops, best of 3: 456 ns per loop
sage: %timeit l = m2()
1000000 loops, best of 3: 1.09 µs per loop
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/18979#comment:17>
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