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Has ticket #6480 been fixed?

asked 2015-06-28 02:47:35 +0200

Alasdair gravatar image

updated 2015-06-28 02:55:28 +0200

The ticket is:

.subs_expr() method doesn't work for argument of D derivative operator

Here is an example (from Sage 6.2, which I'm currently using):

y = function('y',x)
f = function('f',x,y)
d1 = diff(f,x,1)

F*D[1](f)(x, y(x)) + D[0](f)(x, y(x))

So far, all good. But when I try:


I receive the error:

TypeError: argument symb must be a symbol

Maybe my syntax is wrong, so either my question is moot, in which case what am I doing wrong? Or maybe my syntax is correct and the fault is still a ticket for subs_expr. Advice as always would be very welcome!

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answered 2015-06-28 03:30:52 +0200

tmonteil gravatar image

As you can check the ticket is still open.

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Asked: 2015-06-28 02:47:35 +0200

Seen: 258 times

Last updated: Jun 28 '15