How to import data for multiple files using for loop?

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kamal 2019-7-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/472280-how-to-import-data-for-multiple-files-using-for-loop

评论： Raj 2019-8-2

采纳的回答： Raj

I named files as 1.data,2.data,....

I want to import these data,process the data using functions,plot the processed data.

my code is

When i give nname in command window it is showing 1.data. but i am getting error as

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Answer 1

Raj 2019-7-18

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https://ww2.mathworks.cn/matlabcentral/answers/472280-how-to-import-data-for-multiple-files-using-for-loop#answer_383729

在 MATLAB Online 中打开

Here is a portion of code I use to read multiple files in cases like this:

for r=1:6 % Number of files
myfilename= sprintf('%i.data',r); %file names as 1.data, 2.data and so on.
filename = fullfile('C:\','Users','User','MATLAB',myfilename); % Put your file path here
fid = fopen(filename,'r'); % Open the file
Mydata = textscan(fid,'%f %f');% Assuming you have 2 columns of floating point data. Update as per your file accordingly.
fid = fclose(fid); % CLose the file
%%Delete temporary variables from workspace
%%Process the data
%%Plot the data
end

Hope this helps!!

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kamal 2019-8-2

I want to save plot as 1.fig ,2.fig....

eval(['hgsave(''myfilename'');']);

All the files are saving in myfilename. Whereas myfilename is different for each loop as 1,2,3,,..6.

how to edit hgsave as to save in loop with different names as 1.fig,2.fig,...6.fig

Raj 2019-8-2

在 MATLAB Online 中打开

I don't think you need eval for this. Try something like this:

for r=1:6 % Number of files
    myfilename= sprintf('%i.data',r); %file names as 1.data, 2.data and so on.
    filename = fullfile('C:\','Users','User','MATLAB',myfilename); % Put your file path here
    fid = fopen(filename,'r'); % Open the file
    Mydata = textscan(fid,'%f %f');% Assuming you have 2 columns of floating point data. Update as per your file accordingly.
    fid = fclose(fid); % CLose the file
    %%Delete temporary variables from workspace
    %%Process the data
    %%Plot the data
    figure(r) % this will give you a new figure for each set of data
    plot(x,y) % Put your data here
    file_name=sprintf('%d',r)
    hgsave(file_name)
end