Jim Clark wrote:
>
> On Oct 22, 2008, at 5:28 PM, Jason Grout wrote:
>
>> I've posted a patch to http://trac.sagemath.org/sage_trac/ticket/4343
>>
>> Can you apply the patch and test it out?
>>
>>
>> Here is the new behavior:
>>
>> sage: f(x,y) = x^n+y^n
>> sage: f.gradient()
>> ((x, y) |--> n*x^(n - 1), (x, y) |--> n*y^(n - 1))
>> sage: f.gradient([y,x])
>> ((x, y) |--> n*y^(n - 1), (x, y) |--> n*x^(n - 1))
>>
> Thanks for the quick response, Jason. As for applying the patch...
>
> I run sage from a binary distribution that I downloaded.
> I know I can manually edit the calculus.py file in the executable
> path on my system.
> Will a changed file be picked up automatically when I run sage?
>
You have to do "sage -b" first.
The -b makes Sage rebuild itself to incorporate changes. The first time
you run it, it will take a while (maybe 20 minutes?). After that,
depending on the changes you make, it will take seconds.
If you're not sure how to apply the patch, probably the easiest way to
apply the patch is to do the following at the sage command line:
hg_sage.apply('http://trac.sagemath.org/sage_trac/attachment/ticket/4343/gradient.patch?format=raw')
Then quit out of Sage, run sage -b, then start sage back up again.
Thanks,
Jason
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