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eigenvals of empty matrix raises IndexError #10719

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argriffing opened this issue Mar 3, 2016 · 1 comment · Fixed by #10750
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eigenvals of empty matrix raises IndexError #10719

argriffing opened this issue Mar 3, 2016 · 1 comment · Fixed by #10750

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@argriffing
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>>> Matrix([[]]).eigenvals()
Traceback (most recent call last):
[...]
IndexError: Index out of range: a[0]

This appears to be a bug, spotted by @aravindkanna in #10701 (comment). I'd expect eigenvals() of an empty matrix to return an empty collection instead of raising an indexing exception.
@argriffing
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I'm using an old sympy version 0.7.6.

Edit: I see the same error using github master

@argriffing argriffing mentioned this issue Mar 3, 2016
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rd13123013 pushed a commit to rd13123013/sympy that referenced this issue Mar 7, 2016
@d-rishabh
fixed sympy#10719: eigenvals of empty matrix raises IndexError
40f506a
@rd13123013 rd13123013 mentioned this issue Mar 7, 2016
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This was referenced Mar 9, 2016
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leosartaj added a commit that referenced this issue Mar 10, 2016
@leosartaj
Merge pull request #10750 from rd13123013/issue-10719
5ed90ba 
fixed #10719: eigenvals of empty matrix raises IndexError
skirpichev pushed a commit to skirpichev/diofant that referenced this issue Jul 31, 2017
@d-rishabh @skirpichev
Fixed sympy/sympy#10719: eigenvals of empty matrix raises IndexError
88746c8 
// edited by skirpichev
skirpichev pushed a commit to skirpichev/diofant that referenced this issue Sep 21, 2017
@d-rishabh @skirpichev
Eigenvals of empty matrix raises IndexError
acb737b 
Closes sympy/sympy#10719

// edited by skirpichev

Signed-off-by: Sergey B Kirpichev <skirpichev@gmail.com>
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fixed #10719: eigenvals of empty matrix raises IndexError rd13123013/sympy
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@argriffing