Opened 6 years ago

Last modified 3 years ago

#15733 new defect

substitution in symbolic function fails with latex_name

Reported by: dkrenn Owned by:
Priority: major Milestone: sage-6.4
Component: symbolics Keywords: substitute, function, solve, latex_name
Cc: Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

Description

The following substitution does not work: 

sage: function('f', latex_name = 'blub')
f
sage: eq = solve((ln(f(x))==x).diff(x), f(x))[0]
sage: eq
f(x) == D[0](f)(x)
sage: eq.subs(f(x) == 42)
f(x) == D[0](f)(x)

Note that 

sage: bool(eq.lhs() == f(x))
True
sage: id(eq.lhs()), id(f(x))
(119698064, 119698064)

When removing latex_name, everything works fine: 

sage: function('f')
f
sage: eq = solve((ln(f(x))==x).diff(x), f(x))[0]
sage: eq.subs(f(x) == 42)
42 == D[0](f)(x)

Change History (5)

comment:1 Changed 6 years ago by vbraun_spam

  • Milestone changed from sage-6.1 to sage-6.2

comment:2 Changed 6 years ago by vbraun_spam

  • Milestone changed from sage-6.2 to sage-6.3

comment:3 Changed 5 years ago by vbraun_spam

  • Milestone changed from sage-6.3 to sage-6.4

comment:4 Changed 5 years ago by dkrenn

Still there in 6.6.

comment:5 Changed 3 years ago by rws

Note that #6480 will change the r.h.s. too.

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