Save a double array to a text file

Hello,

I have a double array that looks like this:

0.3764 0.6801 0.1926 -0.1987 0.3531

0.0313 -0.2461 0.0218 0.0299 -0.3008

-0.1811 -0.1639 -0.0698 0.0397 -0.2341

0.3469 0.3152 6.1030 -0.3613 0.3749

-0.5791 -0.2253 -0.3613 6.1030 -0.2178

I want to save this to a text file so that the output text file looks exactly like the above data

I tried the dlmwrite command but I do not want to specify precision, and the examples I have found create a file with ' ; ' in between which is not something I want.

Answer 1

[Image Analyst]

Try this:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format short g;
format compact;
fontSize = 18;
fprintf('Beginning to run %s.m ...\n', mfilename);
fileName = 'deleteme.txt';
fid = fopen(fileName, 'wt');
m = [
	0.3764    0.6801    0.1926   -0.1987    0.3531
	0.0313   -0.2461    0.0218    0.0299   -0.3008
	-0.1811   -0.1639   -0.0698    0.0397   -0.2341
	0.3469    0.3152    6.1030   -0.3613    0.3749
	-0.5791   -0.2253   -0.3613    6.1030   -0.2178
	]
[rows, columns] = size(m);
for row = 1 : rows
	for col = 1 : columns
		fprintf(fid, '%f ', m(row, col));
	end
	fprintf(fid, '\n');
end
fclose(fid);
winopen(fileName); % Open in Notepad or Wordpad

[AP]

Great! This worked the way I wanted.Thank you!

Answer 2

[the cyclist]

Regardless of what is displayed to the MATLAB command window (in your case, the default format, it seems), an array of type double is storing 64-bit, double-precision floating-point values.

So, I don't believe it is possible for you to achieve both of the following things you want:

• write that exact format
• do not specify the precision (i.e. format)

Also, all functions that write output have to choose some delimiter by default. Usually, that delimiter can be chosen to be something else.

The writematrix command might do what you want?

[AP]

Thank you!

Answer 3

[madhan ravi]

https://www.mathworks.com/matlabcentral/answers/4175-how-to-save-a-matrix-as-text-file#answer_5892

[AP]

Thank you!