How can I read in specific cells which contain file names ending in 'Pressure.mat'?

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Oliver Bunn
Oliver Bunn 2017-1-11
评论： Stephen23 2017-1-11
I have a list of 490 files in a matrix, I want to only read the files which end in 'Pressure.mat', if it does not end in this I don't want to read it. What function can I use to do this? Even creating a new matrix which only contains these specific cells containing the files would be what I need.

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采纳的回答

KSSV
KSSV 2017-1-11
You can run a loop, and use strfind. Find for Pressure.mat in the string, if the output is not empty, then you have to read the file.
  2 个评论
Oliver Bunn
Oliver Bunn 2017-1-11
I have tried this but this only tells me the position of Pressure.mat rather then outputting the entire file name
KSSV
KSSV 2017-1-11
编辑：KSSV 2017-1-11
You have filename already in hand in matrix...If it is giving indices of position then you have to pick that matrix(i,j) filename. Else not.
M = [{'coolpressure.mat'} {'cool.mat'} ; {'hello.mat'} {'hipressure.mat'}] ;
for i = 1:2
for j = 1:2
idx = strfind(M{i,j},'pressure.mat') ;
if ~isempty(idx)
fprintf('pick the %s file \n',M{i,j})
end
end
end

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更多回答（1 个）

Stephen23
Stephen23 2017-1-11
编辑：Stephen23 2017-1-11
Do not use ugly loops to do this. MATLAB is much more beautiful than that!
Do not use strfind to do this: it will match that string anywhere in the filename, e.g. it will match 'Pressure.mat.txt' or 'Pressure.mat-old', even though these are not what you are looking for.
A much more robust solution is to use regexp to match exactly the string you want:
>> C = {...
'NotThisFile.mat';...
'ThisPressure.mat';...
'YesPressure.mat';...
'NoPressure.mat.txt';...
'WrongPressure.txt';...
};
>> idx = cellfun('isempty',regexp(C,'Pressure\.mat$')); % $ matches end of string!
>> D = C(~idx)
D =
'ThisPressure.mat'
'YesPressure.mat'
You can easily loop over these names:
>> for k = find(~idx)', C{k}, end
ans =
ThisPressure.mat
ans =
YesPressure.mat
Note that regexp is case sensitive. You can use regexpi for a case insensitive match.

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