MATLAB: Dlmwrite gives error message Too many output arguments.

dlmwriteMATLABtoo many output arguments

Dear Sir/Madam,

I have installed Matalb2018b on my Mac OSX 10.13.6. I am trying to use the function dlmwrite but it gives the error message: Too many output arguments. I am using a simple example from the dlmwrite help page. Please follow the commands given in the Command Windows:

>> M = magic(3);

>> dlmwrite dlmwrite('myFile.txt',M)

Error using dlmwrite (line 104)

Too many output arguments.

>> dlmwrite("myFile.txt",M)

Error using dlmwrite (line 104)

Too many output arguments.

>> which all dlmwrite

built-in (/Applications/MATLAB_R2018b.app/toolbox/matlab/ops/all)

>> dbtype 'dlmwrite' 1

1 function dlmwrite(filename, m, varargin)

dlmwrite gives the "Too many output arguments" error message with Matlab 2018b and Matlab 2017b. Instead dlmwrite works fine with MAtlab 2016b and Matlab 2015a. All these versions are installed on this Mac.

Thank you

Best Answer

Use the debugger. It is the best friend of the programmer.

dlmwrite stops in line 104. This is the error handling part of a TRY/CATCH block. To catch an error inside such a block, type this in the command window:

dbstop if caught error
% or
dbstop if all error

Now dlmwrite will stop in the failing line. Maybe you have redefined iscell, cell2mat, error, message, parseinput, isnumeric, ischar strrep, .... The failing line will reveal this.

If the problem is really a redefintion, you can use this tool to detect collisions with built-in functions: File Exchange: UniqueFuncNames

Related Solutions

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

MATLAB: Using dlmwrite to save data

"Too many output arguments." Remove the output, i.e. replace

spillData = dlmwrite('spillData.txt',spillLength,'delimiter',' ');

dlmwrite('spillData.txt',spillLength,'delimiter',' ');

Best Answer

Related Solutions

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

MATLAB: Using dlmwrite to save data

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