Opened 5 years ago

Last modified 4 years ago

#21655 new enhancement

Return (d/dn)f with f(n,x).diff(n) instead of runtime error

Reported by: rws Owned by:
Priority: major Milestone: sage-7.4
Component: symbolics Keywords:
Cc: Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

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Expected behaviour:

sage: hermite(n,x).diff(n)
diff(hermite(n, x), n)

for all cases where we throw runtime or not implemented errors at the moment. This concerns mostly orthogonal poly functions. The aim is a better workflow for the user, with no interrupts.

Change History (3)

comment:1 Changed 5 years ago by mafra

Do you have an idea about what needs to be done in case someone decides to work on this? Ie, some tips about how to start?

comment:2 Changed 5 years ago by rws

The runtime errors are partly thrown in Pynac, they should return fderivative instead like is done with anonymous functions:

sage: f=function('f')(x)
sage: diff(f,x)
diff(f(x), x)
sage: _._dbgprinttree()
fderivative f @0x3dc6b00, hash=0x1023d72de5409a, flags=0xb, nops=1, params=0
    x (symbol) @0x3049d20, serial=5, hash=0xf0a9622e, flags=0xf, domain=0, iflags=0000000000000000

The others are errors thrown in Python. I'm not sure which will be simple to change.

comment:3 Changed 4 years ago by rws

May depend on #24861.

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