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Topic: I'm dense, but...somebody 'splain accumarray() please?
Replies: 23   Last Post: Jul 11, 2013 1:00 PM

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james bejon

Posts: 214
Registered: 3/13/10
Re: I'm dense, but...somebody 'splain accumarray() please?
Posted: Jul 6, 2013 5:48 AM
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% As I understand it, accumarray takes a list of indexes ("subs") and a list of values ("vals"). The output is an array of some kind. The subs tell the function where to put the vals in the final array. Vals assigned to the same sub are then aggregated according to the passed function (the 4th argument). So, if I have subs of [2 3 6 6] with a value of 1, I'll get [0 1 1 0 0 2] as my output:

subs = [2 3 6 6].';
vals = 1;
disp(accumarray(subs, vals))

% The rest just builds up from there.


Date Subject Author
7/5/13
Read I'm dense, but...somebody 'splain accumarray() please?
dpb
7/5/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
dpb
7/6/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
james bejon
7/8/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
Steven Lord
7/8/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
dpb
7/9/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
Steven Lord
7/9/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
dpb
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
Marc
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
Kim Andrews
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
dpb
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
dpb
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
dpb
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
EBS
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
dpb
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
EBS
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
dpb
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
Kelly Kearney
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
dpb
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
dpb
7/11/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
Kelly Kearney
7/11/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
dpb
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
Kelly Kearney
7/10/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
dpb
7/11/13
Read Re: I'm dense, but...somebody 'splain accumarray() please?
Steven Lord

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