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How to vectorize this for loop

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Master Blabla
Master Blabla on 19 Nov 2020
Edited: Master Blabla on 19 Nov 2020
How to vectorize this for loop
%%% F is array of float
%%% SD is two dimension array of float
for i=1:10
F(i) = SD(i,:);
end

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David Hill
David Hill on 19 Nov 2020
You need to provide the Fin() function. With a loop of only 10, why do you want to vectorize?

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Answers (1)

Walter Roberson
Walter Roberson on 19 Nov 2020
Fea = Fin( sub2ind(size(Fin), SD(1:10,:), 20*ones(10, size(SD,2))));
However, your original code would have failed. Your SD is 2d, so SD(i,:) would have been a vector of values, and indexing FD() with a vector of row indices and one column index would return a vector of values rather than a single value -- and so you would not be able to store it into the scalar location Fea(i) .
The only way for your code to work would be if SD were a column vector instead of a 2D array.

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