Index each row of one matrix applying an operator/function to the second matrix, then concatenate all the results.
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Joshua Murray
on 25 Jul 2020
Commented: Joshua Murray
on 27 Jul 2020
I'm fairly new to Matlab. I've got the following code where I'm indexing each row of 'a' and adding it to matrix b. Then I concatenate the resultant values:
a = [0 0;100 100];
b = [1 1; 0 0];
c = a(1)+b;
d = a(2)+b;
e = [c;d];
% the result looks like this (which is the correct result I want):
e =
1 1
0 0
101 101
100 100
% Obviously if I try something like this is doesn't work as the matrix dimensions are different:
% e= a(:) + b
What is the best way to do this so that the concatenating and indexing happens automatically? Should I try and figure out a for loop for every row of matrix 'a' or am I missing an easy function or trick here?
The background to why I'm asking is that I've got two much larger matricies that I have to apply something similar: indexing each row of the first matrix and applying an operator/function to the second matrix with the final matrix being a 'concatenation' of the results. I'm hoping if I can figure it for this simple problem as shown above I can apply similar principals to a large dataset.
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Accepted Answer
madhan ravi
on 25 Jul 2020
z = reshape(a(1:2),1,1,[]) + b;
z1 = squeeze(num2cell(z,[1,2]));
Wanted = cat(1, z1{:})
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