simple formula to remove rows with repeated values in N x 2 matrix

Question

LO 2019-4-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/456045-simple-formula-to-remove-rows-with-repeated-values-in-n-x-2-matrix

回答： Star Strider 2019-4-12

采纳的回答： Star Strider

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I have a set of XY coordinates in a N x 2 matrix

I would like to remove those pairs in which X values are the same

I do not want to use the "unique" function (I tried it but it does not work, perhaps my X values are not exactly the same although they look like they are) and I would not like to use a complicated series of commands...

the code I am using now is

X1=ampl1;
Y1=width1;
A1=[X1;Y1]';
[UniXY,Index]=unique(A1,'rows');
DupIndex=setdiff(1:size(A1,1),Index);
A1(DupIndex,:)=[];
ampl1=A1(:,1)';
widths1=A1(:,2)';

it seems to work for discrete finite values but somehow for my case, it does not work.

I would not mind to round my values but I would like to keep at least 2-3 decimals

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Answer 1

Star Strider 2019-4-12

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/456045-simple-formula-to-remove-rows-with-repeated-values-in-n-x-2-matrix#answer_370399

The uniquetol (link) function (introduced in R2015a) allows you to set a tolerance. Also, setdiff does not have a tolerance option, although ismembertol does.

See if those do what you want.