code that randomly changes columns in matrix throws error

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Berfin Çetinkaya 2022-3-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1678939-code-that-randomly-changes-columns-in-matrix-throws-error

评论： Voss 2022-3-23

采纳的回答： Voss

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I have a matrix

This matrix consists of four rows. Some numbers are integers and some are decimals. I want to print a code on this matrix, but it gives an error like this:

Error using randperm

Size inputs must be integers.

Error in deneme (line 49)

new_idx = randperm(size(D,2)/2)*2-[1; 0];

My code is :

new_idx = randperm(size(D,2)/2)*2-[1; 0];
rassalnew= D(:,new_idx(:))

What can I do to fix this problem?

Thank for help

D matrix:

1 2 3 4

510.090000000000 26.4600000000000 22.3400000000000 188.300000000000

510.090000000000 26.4600000000000 22.3400000000000 169.680000000000

510.090000000000 26.4600000000000 22.3400000000000 188.300000000000

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采纳的回答

Voss 2022-3-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1678939-code-that-randomly-changes-columns-in-matrix-throws-error#answer_925294

编辑：Voss 2022-3-23

在 MATLAB Online 中打开

It seems to be working for that matrix D:

D = [ ...
    1                   2	                3	                4
    510.090000000000	26.4600000000000	22.3400000000000	188.300000000000
    510.090000000000	26.4600000000000	22.3400000000000	169.680000000000
    510.090000000000	26.4600000000000	22.3400000000000	188.300000000000];
new_idx = randperm(size(D,2)/2)*2-[1; 0];
rassalnew= D(:,new_idx(:))
rassalnew = 4×4
    3.0000    4.0000    1.0000    2.0000
   22.3400  188.3000  510.0900   26.4600
   22.3400  169.6800  510.0900   26.4600
   22.3400  188.3000  510.0900   26.4600

But you will get that error if D has an odd number of columns:

D = [ ...
    0       1                   2	                3	                4
    300     510.090000000000	26.4600000000000	22.3400000000000	188.300000000000
    400     510.090000000000	26.4600000000000	22.3400000000000	169.680000000000
    200     510.090000000000	26.4600000000000	22.3400000000000	188.300000000000];
new_idx = randperm(size(D,2)/2)*2-[1; 0];
Error using randperm
Size inputs must be integers.
rassalnew= D(:,new_idx(:))