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[Octave-bug-tracker] [bug #53198] nnz could be improved for diagonal mat
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From: |
Sahil Yadav |
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Subject: |
[Octave-bug-tracker] [bug #53198] nnz could be improved for diagonal matrices |
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Date: |
Wed, 21 Feb 2018 13:03:05 -0500 (EST) |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.167 Safari/537.36 |
Follow-up Comment #1, bug #53198 (project octave):
Indeed the time difference is huge.
I tried the following test script:
N = 1e2;
f = zeros(N,1);
for i=1:N
r = rand(5000,1);
s = diag(r);
tic;
z = nnz(s);
f(i)=toc;
endfor
sum(f)
Got a total time of 0.0039184 seconds with the patch applied and 11.160
seconds without the patch.
Hope this helps :)
(file #43379, file #43380)
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