MATLAB: Good way to import data file

Hey, I need to import a large data file into matlab, but I'm unsure of the best way to do it. I've been experimenting with the fopen and textscan but can't get anything to work correctly. Any help is appreciated.

Best Answer

If the format doesn't change through the file (such that after 10 s, suddenly also data about whatever appears), you can simply use:

fid=fopen('test.txt');
data=textscan(fid,'%*s%f','delimiter',':');
fclose(fid);
t=data{1}(1:4:end);
gs=data{1}(2:4:end);
gflat=data{1}(4:4:end);
gflong=data{1}(3:4:end);

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MATLAB: Dlmwrite problem

See help dlmwrite: This function is though to export matrices, but not cell strings. You can use fprintf instead fpr the header:

outfile = '/path/to/file/output.txt';
header={'feat1','feat2','feat3','feat4','feat5'};
data = magic(5);
fid = fopen(outfile, 'w');
if fid == -1; error('Cannot open file: %s', outfile); end
fprintf(fid, '%s\t', header{:});
fprintf(fid, '\n');
fclose(fid);
dlmwrite(outfile,data,'delimiter','\t','-append');

BTW. you can use fprintf directly for the data also instead of dlmwrite:

Fmt = [repmat('%g\t', size(data, 2)), '\n'];
fprintf(fid, Fmt, transpose(data));
fclose(fid);

This is faster than closing the file and re-opening it for appending through dlmwrite.

MATLAB: I aam having error when i am trying to load csv file and i am having error like this which i mentioned so please help me someone

Try

[num,txt,raw] = xlsread('Book1.csv');

You have all the data in your hand.

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MATLAB: Dlmwrite problem

MATLAB: I aam having error when i am trying to load csv file and i am having error like this which i mentioned so please help me someone

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