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how to delete same data

3 次查看（过去 30 天）
Innosens
Innosens 2012-10-31
i have data
12 0 26 94 1011
12 30 26 100 1011
1 0 26 94 1011
1 30 26 94 1011
*2 0 26 95 1011
2 0 26 94 1011*
2 30 26 100 1010
3 0 26 100 1010
3 30 26 100 1010
4 0 26 94 1009
4 30 25 100 1009
*5 0 25 99 1009
5 0 25 100 1009*
5 30 26 100 1009
i want to delete same data , so the data became that.
12 0 26 94 1011
12 30 26 100 1011
1 0 26 94 1011
1 30 26 94 1011
2 0 26 95 1011
2 30 26 100 1010
3 0 26 100 1010
3 30 26 100 1010
4 0 26 94 1009
4 30 25 100 1009
5 0 25 99 1009
5 30 26 100 1009
i have tired , using unique.. thanks
  6 个评论
显示 4更早的评论
Walter Roberson
Walter Roberson 2012-10-31
Is the rule that if you have two of the same column 2 value in a row, that you should delete the first of them, no matter what the values are in the other columns?
Innosens
Innosens 2012-10-31
walter Roberson one row is removed example
5 0 25 99 1009
5 0 25 100 1009
became
5 0 25 100 1009

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2012-10-31
a = [ 12 0 26 94 1011
12 30 26 100 1011
1 0 26 94 1011
1 30 26 94 1011
2 0 26 95 1011
2 0 26 94 1011
2 30 26 100 1010
3 0 26 100 1010
3 30 26 100 1010
4 0 26 94 1009
4 30 25 100 1009
5 0 25 99 1009
5 0 25 100 1009
5 30 26 100 1009];
out = a([true;diff(a(:,2)) ~= 0],:);

更多回答（1 个）

Walter Roberson
Walter Roberson 2012-10-31
There are no duplicate rows in your data; each one has something unique about it. How should it be determined which one to delete? If certain columns are to be ignored in the matching, then should the first of them be deleted, or the one with the maximum in the column not used for matching, or ... ?
  1 个评论
Innosens
Innosens 2012-10-31
only column 2, because pattern data like that. this only sample data i want to make easy program because my data is large
12 0 26 94 1011
12 30 26 100 1011
1 0 26 94 1011
1 30 26 94 1011
2 0 26 95 1011
2 30 26 100 1010
3 0 26 100 1010
3 30 26 100 1010
4 0 26 94 1009
4 30 25 100 1009
5 0 25 99 1009
5 30 26 100 1009
any idea?

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