Re: Vectorisation

[gastonjulia]

Hi,

thanks for all the suggestions.

`count = accumarray (data(:,3), 1, [1, 20]);' was not quite working, but I
looked up accumarray and found that `count_fast = accumarray
(data(:,3),1:1);' did generate the same vector as for loop solution. I am
still not quite sure about the arguments of accumarray but it does the job
in 1.3 seconds, compared to the for loop which takes 43 seconds.

So thanks very much,
Gaston

p.s.: if it is of any interest, here is the error message of count =
accumarray (data(:,3), 1, [1, 20]);
error: accumarray: inconsistent dimensions
error: evaluating if command near line 67, column 3
error: called from `accumarray' in file
`/usr/share/octave/3.0.5/m/general/accumarray.m'
error: evaluating assignment expression near line 4, column 7
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