WHEN I RUN THIS CODE IT AGAIN AND AGAIN GIVE THIS PROBLEM THAT IS 'Index exceeds matrix dimensions.'

n=('enter the number of rows');
m=('enter the number of columns');
Pmin=[100 50 100];
Pmax=[600 200 400];
PopM=[];
for i = 1:n
    for j = 1:m
        PopM(i,j) = Pmin(j) + rand * (Pmax(j)-Pmin(j));
    end
end
PopM
??? Index exceeds matrix dimensions.

Answer 1

[kjetil87]

You are declaring PopM as

PopM=[];

Then your are telling matlab to acces element i and j of this matrix, but this matrix as the size of 0x0.

PopM(1,1)
??? Index exceeds matrix dimensions.

Instead preallocate with

zeros(n,m)

You will also get this error if m>3 in your code, since

numel(Pmin) is 3
numel(Pmax) is 3

[Jan]

The assigment of PopM(1,1) is correct and works without problems, although a proper pre-allocation would be more efficient. The problem will appear for m>3 only, when the sizes of Pmin or Pmax are exceeded.

[kjetil87]

Yes , you are correct was too quick there =)

Indeed you are not accessing PopM but instead reallocating it every iteration, good you caught that one!