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MATLAB: Failed to correctly write using csvwrite()


MATLAB: Failed to correctly write using csvwrite()

By : user2956589
Date : November 22 2020, 10:56 AM
wish helps you I am trying to write three different arrays into 3 columns in a csv file. This what I have tried : , You should put your data in a matrix:
code :
 m = [1 2 3 4 5 6
      11 12 13 14 15 16
      21 22 23 24 25 26];
 csvwrite('data.csv', m);


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csvwrite in loop with numbered filenames in matlab

csvwrite in loop with numbered filenames in matlab


By : Brian Schroeher
Date : March 29 2020, 07:55 AM
seems to work fine String concatenation in MATLAB is done like a matrix concatenation. For example
code :
a='app';
b='le';
c=[a,b] % returns 'apple'
['/home/amir/amir_matlab/',sprintf('%d_%d',aa,bb),'.csv']
fullfile('home','amir','amir_matlab',sprintf('%d_%d.csv',aa,bb))
csvwrite formatting (strings & overwriting) problems, Matlab

csvwrite formatting (strings & overwriting) problems, Matlab


By : Godra
Date : March 29 2020, 07:55 AM
around this issue Hidden away in the Tips section of the csvwrite documentation:
code :
% write headers
fid = fopen('test.csv','w');
fprintf(fid,'%s,',data1{:});
fprintf(fid,'\n');

% write data...
fprintf(fid,[repmat('%d,',1,numel(data1)) '\n'],data2);
fclose(fid)
How to correctly write this function?(matlab)

How to correctly write this function?(matlab)


By : Joey Yan
Date : March 29 2020, 07:55 AM
this will help MATLAB does not perform implicit multiplication when it encounters a parenthesis. You instead need to explicitly perform multplication using *.
Also, you want asin not arcsin.
code :
asin(sqrt(x * (x^2-1)))
Matlab csvwrite charset, is it ascii?

Matlab csvwrite charset, is it ascii?


By : fepecas
Date : March 29 2020, 07:55 AM
This might help you csvwrite actually calls dlmwrite under the hood. To verify, this is what csvwrite is (in R2017a):
code :
edit csvwrite
function csvwrite(filename, m, r, c)
%CSVWRITE Write a comma-separated value file.
%   CSVWRITE(FILENAME,M) writes matrix M into FILENAME as 
%   comma-separated values.
%
%   CSVWRITE(FILENAME,M,R,C) writes matrix M starting at offset 
%   row R, and column C in the file.  R and C are zero-based, so that
%   R=0 and C=0 specifies first number in the file.
%
%   Notes:
%   
%   * CSVWRITE terminates each line with a line feed character and no
%     carriage return.
%
%   * CSVWRITE writes a maximum of five significant digits.  For greater
%     precision, call DLMWRITE with a precision argument.
%
%   * CSVWRITE does not accept cell arrays for the input matrix M. To
%     export cell arrays to a text file, use low-level functions such as
%     FPRINTF.
%
%   See also CSVREAD, DLMREAD, DLMWRITE.

%   Copyright 1984-2011 The MathWorks, Inc.

%
% test for proper filename
%
if ~ischar(filename) && ~isstring(filename)
    error(message('MATLAB:csvwrite:FileNameMustBeString'));
end

%
% Call dlmwrite with a comma as the delimiter
%

if nargin < 3
    r = 0;
end
if nargin < 4
    c = 0;
end

try
    dlmwrite(filename, m, ',', r, c);
catch e
    throw(e)
end
%dlmwrite(filename, m, ',', r, c);
Matlab error while creating csv file from image set using imread and csvwrite

Matlab error while creating csv file from image set using imread and csvwrite


By : Ekv320
Date : March 29 2020, 07:55 AM
it should still fix some issue csvwrite is meant for writing comma separated values, so adding that ',' is wrong. Then you have put a dot('.') after I(:), which is also wrong. I think you should better use dlmwrite if you want to append the files. It would go like dlmwrite('C:\Users\HP\Desktop\test.csv',I(:)','-append') (since you want each image as one row, you need to transpose the array).
For using this on all images, start by reading all the images into a cell array & then you use cellfun(@(x) dlmwrite('C:\Users\HP\Desktop\test.csv',x(:)','-append'),a). Or for a much simpler version just run the lines in your code inside a for loop.
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