#4974: [with patch, needs work] make sage.libs.pari.gen._normalize_slice a
miscellaneous function for dealing with slices
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Reporter: jason | Owner: craigcitro
Type: defect | Status: assigned
Priority: major | Milestone: sage-3.3
Component: misc | Resolution:
Keywords: |
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Changes (by ylchapuy):
* summary: [with patch, needs review] make
sage.libs.pari.gen._normalize_slice a
miscellaneous function for dealing with slices
=> [with patch, needs work] make
sage.libs.pari.gen._normalize_slice a
miscellaneous function for dealing with slices
Comment:
A lot better, but there are still bugs.
I would recommand to try something like this to test extensively:
{{{
#!python
def safe_norm(i,j,k,l):
try:
return sage.misc.misc_c.normalize_slice(slice(i,j,k),l)
except ValueError:
return "error"
def safe_range(i,j,k,l):
try:
return range(l)[i:j:k]
except ValueError:
return "error"
d=[-5,-4,-3,-2,-1,0,-1,-2,-3,-4,-5,None]
ld=len(d)-1
for r in xrange(500):
i=d[randint(0,ld)]
j=d[randint(0,ld)]
k=d[randint(0,ld)]
l=randint(-8,8)
r1=safe_norm(i,j,k,l)
r2=safe_range(i,j,k,l)
if not r1==r2:
print i,j,k,l,r1,r2
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4974#comment:11>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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