problem using sortcols()

Question

mehdi J 2018-11-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/430698-problem-using-sortcols

回答： Jeremy Huard 2023-1-31

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?

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Stephen23 2018-11-19

编辑：Stephen23 2018-11-19

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?

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Answer 1

Walter Roberson 2018-11-19

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https://ww2.mathworks.cn/matlabcentral/answers/430698-problem-using-sortcols#answer_347750

在 MATLAB Online 中打开

  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)

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mehdi J 2018-11-19

what is "bioma.data.*"?

Walter Roberson 2018-11-19

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.

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Answer 2

Jeremy Huard 2023-1-31

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/430698-problem-using-sortcols#answer_1160465

在 MATLAB Online 中打开

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