How to run a code for several files also how to stop the code for a specific number of files and give output?

I have following code:

A=load('CurRunA.dat');

X=A(:,1); Y=A(:,3);

figure( plot(X,Y)

I want to run this code for several files CurRunA, CurRunB, CurRunC..... How can I run this code automatically for all the files like these and plot the X,Y curve for all those data in a single plot with different colors?

I can rename those files for the sake of programing. Also, if I have 20 files and if I want to do this only up to 10 files, how can I stop the program till 10 and provide the output?

Answer 1

[kjetil87]

PATH = 'C:\myFilesAreHere\';  %remember the last \

files=dir([PATH,'*.dat']) ; %get info about all files in PATH that ends with .dat

fileNames={files.name};     %extract only filenames, put them in a cell.

%im not sure if the filenames are allredy sorted or not but to be sure:
fileNames=sort(fileNames);

nFiles=numel(fileNames);    %count number of files

colorMap={'red','blue','green',... etc}  % if your run out of colors use e.g '-.red'

for i=1:min(nFiles,10)      %run for either 1:10 or 1:nFiles if nFiles<10.

        A=load([PATH,'fileNames{i}']);

        % your code

        figure;plot(X,Y,colorMap{i} );
  end

%%%%%%% END %%%%%

This ok? =)

[kjetil87]

Oh sorry, you said same plot.

change figure;plot(...) with:

figure   %before loop.
hold on
plot(X,Y,colorMap{i}); %inside loop

[aneps]

Showing error! Unable to read file. Error in reading A=load([PATH,'filenames{i}']);

I put path like this:

PATH='E:\Trapgeofiles\simion\Data\test folder\'

The .dat files are in the 'test folder'.

[kjetil87]

My bad, there should not be quotes '' on fileNames{i} (since fileNames i is a char array, with quotes its seen as a string )

correct:

A=load([PATH,fileNames{i}]);

[aneps]

again another error!: "Cell contents reference from a non-cell array object. " . What does it mean? :(

[kjetil87]

It means you are trying to index with {i} on something that is not a cell. (Also in your first post you typed filenames with a small n, i used capital N ).

Make sure that

fileNames={files.name}; (<-- note brackets not parantheses)

and that

colorMap={...} % colors.

i have tested this now :P , so somewhere you forgot to use {}.

Example test script:

obj1=1:10;
obj2=4:15;
obj3=5:16;

save('file1.dat','obj1','-ASCII');
save('file2.dat','obj2','-ASCII');
save('file3.dat','obj3','-ASCII');

clear all;

PATH = [cd,'\'];
files=dir([PATH,'*.dat']) ;
fileNames={files.name}; 
fileNames=sort(fileNames);
nFiles=numel(fileNames); 
colorMap={'r','b','g'};
figure;hold on;
for i=1:min(nFiles,10)  

       A=load([PATH,fileNames{i}]);
       X=1:numel(A); 
       Y=A;

       plot(X,Y,colorMap{i});

end

[aneps]

Yes, thank you. I put fileNames=(files.name)! OK. But now I am getting only one plot. I put

figure

hold on (before the for loop) and

plot(X,Y,colorMap{i}); (inside the loop).

But still I am getting only one plot!

[kjetil87]

Do you want one figure for each A? if so put figure inside loop.

Otherwise makes sure you found all files, try a

disp(nFiles) in there

If nFiles>1 and you still only get one "plot" , check what color it has, maybe the contents of the files are all the same?