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[Octave-bug-tracker] [bug #57909] incorrect result for sparse matrix exp
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From: |
Nicholas Jankowski |
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Subject: |
[Octave-bug-tracker] [bug #57909] incorrect result for sparse matrix exponentiation |
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Date: |
Thu, 27 Feb 2020 14:30:45 -0500 (EST) |
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User-agent: |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36 |
Follow-up Comment #3, bug #57909 (project octave):
Matlab 2019a:
>> a = sparse (4, 6);
b = sparse (4, 6);
a(2,2) = 1;
b(3,3) = 2;
a(3,4) = 3; b(2,4) = 4;
a(2,5) = 5; b(3,5) = 6;
a(4,6) = 7; b(4,6) = 8;
>> full (a .^ b)
ans =
1 1 1 1 1 1
1 1 1 0 1 1
1 1 0 1 0 1
1 1 1 1 1 5764801
>> full (a) .^ full (b)
ans =
1 1 1 1 1 1
1 1 1 0 1 1
1 1 0 1 0 1
1 1 1 1 1 5764801
>> a = sparse (0)
a =
All zero sparse: 1×1
>> b = sparse (2)
b =
(1,1) 2
>> a.^b
ans =
All zero sparse: 1×1
>> 0.^2
ans =
0
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