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Re: vectorization
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From: |
Andreas Weber |
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Subject: |
Re: vectorization |
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Date: |
Mon, 12 Jan 2015 22:01:43 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.3.0 |
Am 12.01.2015 um 20:33 schrieb Nidjara:
> csv100K.csv <http://octave.1599824.n4.nabble.com/file/n4668085/csv100K.csv>
Great. Reading a CSV is really fast:
tic; X = csvread ("csv100K.csv"); toc;
Elapsed time is 0.17002 seconds.
tic; G = sparse (X(:,1)+1, X(:,2)+1, X(:,3)); toc;
Elapsed time is 0.0202072 seconds.
G =
Compressed Column Sparse (rows = 100000, cols = 99328, nnz = 100000
[0.001%])
(2, 1) -> 861
(3, 1) -> 871
(5, 1) -> 467
(9, 1) -> 6950
(10, 1) -> 5312
(11, 1) -> 4556
(14, 1) -> 9999
....
Andy