Help for vectorization??

2016 1 26
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更新时间：2016 1 27
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incI=zeros(length(featInd),length(tempInd));
for f = 1:length(featInd)
incI(f,:) = tempInd + featInd(f);
end
for k=1:length(featInd)
h([incI(k,:)]') = h([incI(k,:)]')+ 1;
end

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jgg
jgg 2016-1-26
You need to provide more information. What is h? What is featInd? What is tempInd? How are they structured?
Parag Patil
Parag Patil 2016-1-26
featInd=[1,24636] row vector
tempInd=[1,12332] row vector
h=[14593760,1] coloumn vector

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Honglei Chen
Honglei Chen 2016-1-26
编辑：Honglei Chen 2016-1-26

1 个投票

Here is an example you can try
featInd = 1:24636;
tempInd = 1:12332;
incI = bsxfun(@plus,featInd(:),tempInd);
As to the second loop, I could be wrong but that looks just like a histogram for me, so you can probably do something like
[incU,~,incInd] = unique(incI(:),'stable');
h = zeros(14593760,1);
h(incU) = h(incU)+accumarray(incInd,ones(numel(incInd),1));

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Honglei Chen
Honglei Chen 2016-1-26
Updated the code with correct dimension, although the dimension of h may depend on what you have in featInd and tempInd
Parag Patil
Parag Patil 2016-1-27
Thanks Honglei Chen tried your approach for second loop. Works for smaller values of tempInd & featInd. For large values unique function gives out of memory error when executed on GPU.

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