Help with operation of multiple files

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aurc89 on 13 Oct 2014
Edited: per isakson on 14 Oct 2014
I have a set of data saved in a file (Test.time.00001.Master.Scope) with two columns, x column and y column: for each value of x, a value of y is assigned. Let's suppose I have different files like this (Test.time.00002.Master.Scope, Test.time.00003.Master.Scope...), saved separately in a folder. Can you suggest me a code doing the following instructions?
1) load these files all together, simply giving to the program the path of the folder containing them (I don't know how to do this)
2) calculate the maximum value of y column, ymax, and the associated value of x , x_m, for every file
3) save all these x_m values in a vector called z
Thank you
Stephen23 on 14 Oct 2014
Please edit your question and tell us what file format these files use. Without knowing this critical piece of information, it is impossible to say how you should load the data into MATLAB.

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Answers (1)

per isakson
per isakson on 13 Oct 2014
Edited: per isakson on 14 Oct 2014
Assumptions: The files you want to read are the only files matching *.txt in the folder
I would use a script looking something like this
folder_with_data = 'c:\your\folder\with\data';
sad = dir( fullfile( folder_with_data, '*.txt' ) );
z = nan( length( sad ), 2 );
for jj = 1 : length( sad )
filespec = fullfile( folder_with_data, sad(jj).name );
x_y = dlmread( filespec, 'Delimiter', '' );
[ ~, ix_max ] = max( x_y(:,2) );
z( jj, : ) = x_y( ix_max, : );
I leave testing to you!
sad = dir( fullfile( folder_with_data, '*.txt' ) );
sad = dir( fullfile( folder_with_data, 'Test.time.*.Master.Scope' ) );
and replace
'Delimiter', ''
'Delimiter', ';'
where ';' stands for your list separator character. (or remove 'Delimiter','', default might do it.)
per isakson
per isakson on 14 Oct 2014
Use the documentation. It's actually rather good. See addendum to my answer.

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