Assume a 10 x 3 matrix. Column 1 contains decimal numbers from +1.000 to -1.000. Columns 2 & 3 contain integers. How can I create a new 10 x 3 matrix with the numbers in column 1 arranged from +1 at top to -1 at the bottom?

Rearrange 10 x 3 matrix so first column decimal numbers are arranged in descending order of magnitude from +1.0 to -1.0

[Stephen23]

Is this homework?

Answer 1

[Stephen23]

You can use sortrows with the second optional argument to select the column and sort direction:

>> A = [0.6,2,4;-0.2,5,3;1,3,8;-1,5,2];
>> sortrows(A,-1)
ans =
            1            3            8
          0.6            2            4
         -0.2            5            3
           -1            5            2

[Don Brohaugh]

Thanks! This is exactly what I will need, but the actual matrix size will be 60 x 3. No, it is not homework but for development of a matrix electrical power converter concept that I am working up.