how to exclude a row from a matrix

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D.J
D.J 2018 年 10 月 3 日
コメント済み: D.J 2018 年 10 月 3 日
Hi all, I need to extract all data from a matrix except for one row (the 3rd from last).
Say for example I have the matrix below and I want to exclude this row: [NAN,7,7] Any idea how to do that? Many thanks
T=[1,2,3;4,5,6;7,8,9;1,2,3;4,5,6;7,8,9; NAN,7,7;4,5,6;7,8,9]
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Bob Thompson
Bob Thompson 2018 年 10 月 3 日
I would suggest using an isnan check. Not entirely sure how it will treat an entire row, but a place to start.
T=[1,2,3;4,5,6;7,8,9;1,2,3;4,5,6;7,8,9; NAN,7,7;4,5,6;7,8,9];
T = T(~isnan(T),:);
I suspect you will need:
T = T(~isnan(T(:,1)),:);

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the cyclist
the cyclist 2018 年 10 月 3 日
Assuming that what you want is to exclude any row with a NaN in any position, then either
T = T(all(~isnan(T),2),:);
or
T(any(isnan(T),2),:) = [];
will do the job.
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D.J
D.J 2018 年 10 月 3 日
There was a problem with the first option, but the 2nd one worked perfectly well. Thank you very much.

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