MATLAB: Fopen fails to open the file

file not foundfopen

Hi there,

small example file (test.m):

 if true
clear all; clc;
disp(fopen('C:/test/test.csv'));
disp(fopen('test.csv'));
  end

my current directory is also C:/test/ and the file (test.csv) exits as well.

but still both lines of code return the value -1 which indicates that the file couldn't be found and I don't know why.

Any hint?

Best Answer

Is test.csv opened in another application?

Related Solutions

MATLAB: Slash / after text .txt

Just print it before closing the file.

% open your file for writing
fid = fopen('test.txt','wt');
fprintf(fid,'super\n');
% write the matrix
myData = randi(255,10,3);
  if fid > 0
       fprintf(fid,'%d %d %d\n',myData');
  end
fprintf(fid,'/');
fclose(fid);

MATLAB: How to convert ‘comma’ to ‘dot’

You can use my function fstrrep to replace each . with a , and then use dlmread to read the data:

fstrrep('test22.txt', ',', '.')
data = dlmread('test22.txt')

The m-file:

function fstrrep(filename, oldsubstr, newsubstr, newfilename)
%FSTRREP Replace string in file.
%


%FSTRREP(FILENAME, OLDSUBSTR, NEWSUBSTR, [NEWFILENAME])read each line in
%FILENAME and replaces the string OLDSUBSTR with NEWSUBSTR and writes the
%new line to NEWFILENAME. If the optional argument NEWFILENAME is not
%given, the contents of the original file is changed.
%
%Example: In file 'test.txt', replace each ',' with a '.'
%  fstrrep('test.txt', ',' '.')
%
%Thorsten.Hansen@psychol.uni-giessen.de
%%open file to read from and new file to write to
fid1 = fopen(filename, 'r');
if fid1 == -1
  error(['Cannot open file ' filename ' for reading.']);
end
if nargin < 4
  newfilename = '_temp.txt';
end
fid2 = fopen(newfilename, 'w');
if fid2 == -1
  error(['Cannot open file ' newfilename ' for writing.']);
end
%%read line and write changed line to new file
line = fgets(fid1);
while line ~= -1
  newline = strrep(line, oldsubstr, newsubstr);
  fprintf(fid2, '%s', newline);
  line = fgets(fid1);
end
%%close both files
st = fclose(fid1);
if st == -1
  error(['Cannot close ' filename '.'])
end
st = fclose(fid2);
if st == -1
  error(['Cannot close ' tempfilename '.'])
end
%%replace old file with new file
if nargin < 4
  movefile(newfilename, filename)
end

Best Answer

Related Solutions

MATLAB: Slash / after text .txt

MATLAB: How to convert ‘comma’ to ‘dot’

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