How to delete repeating column or duplicate column in MATLAB? of type Double

Question

raghavendra kandukuri 2019-5-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/462716-how-to-delete-repeating-column-or-duplicate-column-in-matlab-of-type-double

评论： dpb 2022-8-28

Hi,

How to delete the repeating or duplicate columns in matrix, is there any function in MATLAB?, for example in the input array row 2 are basically the occurance or row 1 values, so i am basically counting how many times that partiuclar value in row 1 has appeared in row 1.

Thanks in Advance

input array:
     2    2    5    1    1   3   4    3    4
     2    2    1    2    2   2   2    2    2
output array:
     2  5  1  3  4
     2  1   2  2  2
or more precise
   1 2 3 4 5
   2 2 2 2 1

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the cyclist 2019-5-17

Is the "more precise" one like that because it is sorted by the top row?

Is there any special way to handle repeated values in the top row?

raghavendra kandukuri 2019-5-17

The More precise is the sorted order of ouput array

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Answer 1

Matt J 2019-5-17

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/462716-how-to-delete-repeating-column-or-duplicate-column-in-matlab-of-type-double#answer_375525

编辑：Matt J 2019-5-17

在 MATLAB Online 中打开

output_array=unique(input_array.','rows').'

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omran alshalabi 2022-8-28

编辑：dpb 2022-8-28

在 MATLAB Online 中打开

how to code to delet repeating value in a row like this:

from

a = [1 2 2 4 4 2 2 1 1 4 4 ]

become

b = [1 2 4 2 1 4]

dpb 2022-8-28

在 MATLAB Online 中打开

This really should be a new Q? because to Answer here isn't responsive to the original -- but...

a = [1 2 2 4 4 2 2 1 1 4 4 ] ;
ix=find(diff(a));
a([1 ix+1])
ans = 1×6
     1     2     4     2     1     4

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Answer 2

dpb 2019-5-17

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/462716-how-to-delete-repeating-column-or-duplicate-column-in-matlab-of-type-double#answer_375528

编辑：dpb 2019-5-17

在 MATLAB Online 中打开

>> uA=unique(A);
>> B=[uA;histc(A,uA)]
B =
     1     2     3     4     5
     2     2     2     2     1
>> 

ADDENDUM: Above works with only the first row and computes the counts on the presumption they had to have been obtained somewhere before to have been posted...