#6756: [with patch, needs review] Implement ``diff`` format symbolic derivative
in
new symbolics
-------------------------+--------------------------------------------------
Reporter: gmhossain | Owner:
Type: enhancement | Status: new
Priority: major | Milestone:
Component: symbolics | Keywords:
Reviewer: | Author: Golam Mortuza Hossain
Merged: |
-------------------------+--------------------------------------------------
Changes (by gmhossain):
* cc: ncalexan (added)
Comment:
Replying to [comment:2 ncalexan]:
> I am interested in reviewing this, but I'm not sure that I can at this
time. I have a heavily modified {{{Sage Version 4.1.rc1, Release Date:
2009-07-07}}} tree that I can't really upgrade right now. I have applied
this patch and installed your modified spkg. I am getting the following
doctest failures
>
{{{
**********************************************************************
File "/Users/ncalexan/sage-4.1-OSX-10.5-Intel-64bit-i386-Darwin/devel
/sage-main/sage/symbolic/derivative.py", line 51:
sage: f(x).diff(x)
Expected:
diff(f(x), x, 1)
Got:
D[0](f)(x)
}}}
[[BR]]
Thanks Nick for trying it out. From this error, it seems
"diff_derivative_level" flag wasn't set to
value greater than "0". It could be that "set_diff_derivative_level()"
failed to set it properly.
[[BR]]
> When I work from the command line, I get things like
> {{{
> sage: default_level=set_diff_derivative_level()
> sage: set_diff_derivative_level(1)
> sage: f(x) = function('f', x)
>
---------------------------------------------------------------------------
> TypeError: Symbolic function f takes exactly 2 arguments (1 given)
> }}}
[[BR]]
This looks really weired to me. Does it work before calling
"set_diff_derivative_level()"?
I can suggest you to check three things
(1) Ensure in "symbolic/pynac.pyx" you have a line:
{{{
"cdef public int diff_derivative_level = 0"
}}}
May be you can set it to "1", to enable "diff" by default.
(2) In "symbolic/all.py" you have a line:
{{{
"from derivative import symbolic_diff"
}}}
(3) In "calculus/calculus.py" the following line is commented out or
removed
{{{
"syms['diff'] = dummy_diff"
}}}
If these three lines are fine then it should work. Some doctests may it
still
fail if "set_diff_derivative_level()" isn't working properly but you can
always change value in (1) manually without using it.
Please let me know if that works.
Best,
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6756#comment:3>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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