find a Nan in column of cell array and delete the row

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Alex
Alex 2013년 12월 5일
댓글: sixwwwwww 2013년 12월 5일
Hi everyone, I have a cell array (1152,4) In this cell array I would like see if in each column 1,2,3,4 if there is a Nan, if there is a Nan I would like delete the row.
For that I try to use : cellfun(@isnan,newTab,'UniformOutput',false) and it sends a matrix with logical value (0/1), how can I delete row if there is a 1 in my matrix?
Thank you

답변(5개)

sixwwwwww
sixwwwwww 2013년 12월 5일
편집: sixwwwwww 2013년 12월 5일
here is an example which can give you idea how you can do it:
a = rand(1152, 4);
a(randi(1152, 1, 20), :) = NaN;
a = num2cell(a);
b = cellfun(@isnan, a);
idx = find(b(:,1));
for i = 2:size(a, 2)
idx = union(idx, find(b(:,i)));
end
a(idx, :) = [];

Alex
Alex 2013년 12월 5일
편집: Alex 2013년 12월 5일
thank you, just why you start the loop to i=2 and not i=1?
  댓글 수: 1
sixwwwwww
sixwwwwww 2013년 12월 5일
because of this:
idx = find(b(:,1)); and also we need to use intersect afterwards which need to arrays so i calculated the first and then started the loop from 2

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Alex
Alex 2013년 12월 5일
편집: Alex 2013년 12월 5일
and why the loop is used ? If I try only:
b = cellfun(@isnan, a);
idx = find(b(:,1));
a(idx, :) = [];
It works?!?
  댓글 수: 1
sixwwwwww
sixwwwwww 2013년 12월 5일
no it will not work because if NaN will appear in 2nd or 3rd or 4th column then that row will not be deleted because we are not getting indices for those rows. I edited my answer which has small mistake. So you can accept my edited question. I correct it

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Jos (10584)
Jos (10584) 2013년 12월 5일
If your cell array C has only numbers or NaNs, this will do the job
C = {1 2 3 4 ; 11 12 NaN 14 ; 21 22 23 24}
C(any(isnan(cell2mat(C)),2),:) = []
If your cell array C has a mixture of numbers, char arrays or NaNs, the one-liner above will not work, but this will:
C = {1 2 3 4 ; 'DeleteThisRow' 12 NaN ones(3) ; 21 rand(2) 23 24:29}
C(any(cellfun(@(x) numel(x)==1 & isnumeric(x) && isnan(x),C),2),:) = []

Alex
Alex 2013년 12월 5일
thank you but my real probleme is that I got several table:
infrastructure.capteur(1,1).tableau %1st tab
infrastructure.capteur(2,1).tableau %2nd tab
... there a 8 tab
When there is a Nan is a row, i need to delete each rows in each tabs
  댓글 수: 1
sixwwwwww
sixwwwwww 2013년 12월 5일
then you can use for loop to do it. Access data from each tab in a big cell array and then check each cell array and delete the rows which contain NaN

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