Converting a Data Array into a Larger Array Given a Logical Array

I'm attempting to apply a small data set onto a larger array given a logical array and can't figure out how to tackle the problem. As an example given a much smaller array.

Logical Array [1,0,1,0,1,0,0,0,1]

Data Array [5,3,7,4]

Output [5,0,3,0,7,0,0,0,4]

Any guidance would be apprieciated.

Answer 1

[Stephen23]

>> idx = logical([1,0,1,0,1,0,0,0,1]);
>> dat = [5,3,7,4];
>> out = zeros(size(idx)); % preallocate
>> out(idx) = dat
out =
   5   0   3   0   7   0   0   0   4