Matrix subtraction makes the model too slow

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NN 2021-5-6

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https://ww2.mathworks.cn/matlabcentral/answers/822910-matrix-subtraction-makes-the-model-too-slow

评论： Steven Lord 2021-5-6

The below code makes the model too slow:

Data(i,:)=Data1(i,:)-Data2(i,:);

is there any alternative way to solve this ?

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Answer 1

Jan 2021-5-6

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https://ww2.mathworks.cn/matlabcentral/answers/822910-matrix-subtraction-makes-the-model-too-slow#answer_693365

No. This is an elementary operation. As long as Data has been pre-allocated properly, this cannot be accelerated or omitted.

If this is really the bottleneck of your code, you cannot change it.

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Steven Lord 2021-5-6

It may be possible to change the code to remove the bottleneck, depending on why it's a bottleneck. If for instance you had a for loop to perform this subtraction on each row in turn and neither Data1 nor Data2 change inside the loops, pulling the subtraction outside the loop and doing the subtraction on the entire Data1 and Data2 arrays may improve the performance especially if the whole arrays are large enough to trigger MATLAB to multithread the subtraction but the individual rows are not large enough.

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