how to delete NA from specific rows without delete NA included in strings?

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chocho on 8 Mar 2017

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Commented: chocho on 9 Mar 2017

what's wrong with this command isempty(strfind(l,'NA')) ??

i have used the code below to delete NA rows but when i execute it i found all NA's rows deleted even NA included in strings such as 'RNASE', 'GNAS'.....

fid = fopen('file1.txt','rt');    %open original file
fid2= fopen('file2.txt','wt');      % open new text file
l= fgetl(fid); %first line
l= fgetl(fid); % the second line
while ~feof(fid)
  l=fgetl(fid); %get the next lines
  if isempty(strfind(l,'NA'))==0      %remove NA rows
  else
      idx=regexp(l,'\t','split');
      [nrow,ncol]=size(idx);         %size of idx (total number of columns in every row)
      .........
    end
end

input:

0.121213 NA 0.589999
0.421566 RNASE 0.356955
0.11111 GNAS 0.0311120
0.158881 NA 0.0158999
0.122222 SLTP 0.016666

output:

0.122222 SLTP 0.016666

output wanted:

0.421566 RNASE 0.356955
0.11111 GNAS 0.0311120
0.122222 SLTP 0.016666

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Answer 1

Stephen23 on 8 Mar 2017

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https://au.mathworks.com/matlabcentral/answers/328746-how-to-delete-na-from-specific-rows-without-delete-na-included-in-strings#answer_257832

Edited: Stephen23 on 8 Mar 2017

Open in MATLAB Online

Try this instead:

if isempty(regexp(l,'\sNA\s','once'))

or perhaps (but less robust):

if isempty(strfind(l,' NA '))

Note also that I removed the unnecessary if- else. Your code currently deletes every row with NA: but you can see that this line also has NA in it:

0.421566 RNASE 0.356955

so it will also get deleted, even though this is not what you want. You want to check for lines that also have space on either side of the NA, like I showed above.