Delete unique element in column
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Hi I have a 25,000,000x2 matrix. I want to delete all Rows which have the same elements in column 1. So I would require only unique elements in column 1 and their corresponding values in column 2.
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Jan
2012 年 6 月 29 日
編集済み: Jan
2012 年 6 月 29 日
Mate 2u has written as comment to my wrong answer:
Hi Jan for [1,2; 1,3; 3,4] we would expect to see => [1,3; 3,4] as 1 occured more than once (take the last of the non unique values).
This means, that he does not "want to delete all Rows which have the same elements in column 1".
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