sortind, sortindc

Purpose

Returns the sorted index of x.

Format

ind = sortind(x)

ind = sortindc(x)

Parameters:

x (Nx1 column vector) – data

Returns:

ind (Nx1 vector) – represents sorted index of x.

Examples

// Create uniform random integers between 0 and 10
x = round(10*rndu(10, 1));

ind = sortind(x);
y = x[ind];

After running the above code:

      9.00
      8.00
x  =  0.00
      4.00
      6.00

      3.00
      4.00
ind = 5.00
      2.00
      1.00

      0.00
      4.00
y  =  6.00
      8.00
      9.00

Remarks

sortind() assumes that x contains numeric data. sortindc() assumes that x contains character data.

This function can be used to sort several matrices in the same way that some other reference matrix is sorted. To do this, create the index of the reference matrix, then use submat() to rearrange the other matrices in the same way.