How can I strip duplicates?

I wish to remove all duplicate rows based off of the first column. That is, I want to just strip the excess away. I am struggling to understand how to implement "unique" here. Thanks in advance

[dpb]

Looks like you probably just want the 'rows' optional parameter...

res=unique(data,'rows');    % keep original, too, or
data=unique(data,'rows');   % throw the original duplicates away

[Cris LaPierre]

Perhaps something got lost as you transferred your answer here, but it looks like both lines of code will produce the same output.

[dpb]

Yes, but as the comments note the second overwrites the data array whereas the first creates a new result variable, keeping the original data as well in case there is some other reason to have it, too, going forward.

[Cris LaPierre]

Ah, got it. Thanks.

[per isakson]

The values in the first column are not whole numbers. Thus uniquetol is appropriate.

Answer 1

[Fangjun Jiang]

If you want

1. remove duplicates only based on values in the first column
2. Do not want the returned values be sorted

then you need to do this

in=[[5;5;5;4;4;4;3;3;3;1],(1:10)'];
[~, index]=unique(in(:,1),'stable');
out=in(index,:)