Duplicate a matrix using nested for loops

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Tyler M on 20 Feb 2018
Commented: Stephen23 on 20 Feb 2018
In Matlab I have been trying to duplicate matrix A [2,4,1;6,7,2;3,5,9] to matrix B using nested for loops. I know the general format uses an algorithm within the loop ie.
m=3
n=3
b=zeros(m,n)
for i=1:m
for j=1:n
B(m,n)= *algorithm here*
end
end
I can not find an algorithm that would work for this matrix and I believe that it was designed this way on purpose. I have tried pulling numbers out of matrix A using
A=[2,4,1;6,7,2;3,5,9]
for c=A(1,:)
for d=A(2,:)
for e=A(3,:)
end
end
end
B=[c;d;e]
but this just assigns the values for the last column of A to a 1x3 matrix B (B=[1;2;9]
I have also tried scouring the www for help with how to duplicated a matrix that is not algorithmic using nested for loops to no avail.
Any help or guidance would be much appreciated.
Stephen23 on 20 Feb 2018
???
Why not just avoid the pointless loops and use B=A ?

Roger Stafford on 20 Feb 2018
What's wrong with
B = A; % ?
However, if you absolutely must do it with nested for-loops then do:
[m,n] = size(A);
B = zeros(m,n);
for i1 = 1:m
for i2 = 1:n
B(i1,i2) = A(i1,i2);
end
end
_
Tyler M on 20 Feb 2018
I see your points. I will definitely keep these in mind while writing code in the future!

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