How to have array in for loop

Hi,

So I have a matrix and I want to divide some columns by other columns in a for loop, because I want to divide sets of 3 columns by different sets, so i have created this example:

one=1:24;
two= 25:48;
three=49:72;
four=73:96;
M=[one;two;three;four]

for i=1:4
    for j=1:3
        Mnew(i,j)=M(i,j)./M(i,16:18);
    end
    for j=4:6
        Mnew(i,j)=M(i,j)./M(i,19:21);
    end
end

How can I make j=1:3 literally an array such as 16:18, because now it won't let me run this.

Answer 1

[Alan Stevens]

Like so:

one=1:24;
two= 25:48;
three=49:72;
four=73:96;
M=[one;two;three;four];

for i=1:4
        j = 1:3;
        Mnew(i,j)=M(i,j)./M(i,16:18);
    
        j = 4:6;
        Mnew(i,j)=M(i,j)./M(i,19:21);
    
end