problem using sortcols()

Hi everybody, I have a matrix and I want to sort the colums based on the value of a rows. for example consider A:

A =
    24    35    46    23    20    31    30    38    37
    10    25    15    10    15    15     5     10     5

I want to extract the matrix B as follow:

B =
    30    37    24    23    38    46    20    31    35
     5     5    10    10    10    15    15    15    25

I've tried to do it with 'sortcols' order but I've faced with this error "Undefined function or variable 'sortcols'".

How could I fix it?

[Stephen23]

sortcols is in the Bioinformatics Toolbox. Do you have the Bioinformatics Toolbox installed and a valid license for it? Do you have a DataMatrix object (exactly as the sortcols help states that it requires)?

Your example seems to show a double matrix. Why are you trying to use sortrows on a double matrix? Did you read its help?

Answer 1

[Walter Roberson]

  A = [  24    35    46    23    20    31    30    38    37
        10    25    15    10    15    15     5     10     5];
  import bioma.data.*
  DM_A = DataMatrix(A);
  B = sortcols(DM_A)

[mehdi J]

what is "bioma.data.*"?

[Walter Roberson]

The dodocumentation says:

"The DataMatrix constructor function is part of the microarray object package. To make it available, type the following in the MATLAB® command line:

import bioma.data.*

Otherwise, use bioma.data.DataMatrix instead of DataMatrix, in the following syntaxes."

I would suggest that if you are not doing work with the bioinformatics Toolbox that you should not be using sortcols.

Answer 2

[Jeremy Huard]

Even though there is no sortcols function for double matrices, you could transpose A and use the sortrows function before transposing back:

A = [24    35    46    23    20    31    30    38    37;
    10    25    15    10    15    15     5     10     5]

A = 2×9

24 35 46 23 20 31 30 38 37 10 25 15 10 15 15 5 10 5

B = sortrows(A',2)' 

B = 2×9

30 37 24 23 38 46 20 31 35 5 5 10 10 10 15 15 15 25