MATLAB: Write a for loop that goes through each row of Matrix

forloopindexindexingloopMATLABmatrix

Hi
I'm kinda stuck here, how to write a for-loop that goes through each row of matrix Z and does the following:
  • If the second column value is 1, display the first column value;
  • if the second column value is 2, display the negative of the first column value;
  • if it is 3 then times the first column by 2
Here's what I currently have:
for i = 1:size(Z,1)
  
   if Z(i,2)==1
       value1 = Z(i,1)
       disp(value1)
   
   else Z(i,2)==2
       value2 = Z(i,1)<0
       disp(value2)
   end
   
   if Z(i,2)==3
       value3 = Z(i,1)*5
       disp(value3)
   end
   
end
The Z can be any matrix, e.g.,
    Z = [27     3;
    55     3;
    53     2;
    24     3;
    49     1;
    63     1];

Best Answer

for i = 1:size(Z,1)
and refer to Z(i,1) and Z(i,2)
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