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Problem with factor and imag.

asked 2020-10-17 20:56:49 +0200

lfc gravatar image

updated 2020-10-18 09:01:58 +0200

slelievre gravatar image

I'm new to SageMath, and I'm not sure what's going wrong.

Here are the commands I enter and results I get:

sage: a, b, z = var('a, b, z')
sage: P = a*x - b*x
sage: Q = a*imag(z) - b*imag(z)
sage: P.factor()
(a - b)*x
sage: Q.factor()
0

Why is Q factoring to 0?

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Comments

Weird. assume(z, 'complex') seems to help.

rburing gravatar imagerburing ( 2020-10-18 02:16:40 +0200 )edit

Also

sage: Q.simplify_full()                                                         
0
FrédéricC gravatar imageFrédéricC ( 2020-10-18 09:33:42 +0200 )edit

Possible serious bug. Advice requested on sage-devel.

Emmanuel Charpentier gravatar imageEmmanuel Charpentier ( 2020-10-18 14:54:13 +0200 )edit

1 Answer

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answered 2020-10-19 08:47:34 +0200

Emmanuel Charpentier gravatar image

This is now Trac#30793, discussed in sage-devel.

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Comments

Great news!

lfc gravatar imagelfc ( 2020-10-23 21:51:59 +0200 )edit

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Asked: 2020-10-17 20:56:49 +0200

Seen: 119 times

Last updated: Oct 19 '20