How to vectorize this for loop

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

[David Hill]

You need to provide the Fin() function. With a loop of only 10, why do you want to vectorize?

[Star Strider]

Related: Vectorize two for loops

[Master Blabla]

F

Answer 1

[Walter Roberson]

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.