Save a double array to a text file
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AP
am 3 Apr. 2021
Bearbeitet: Image Analyst
am 4 Apr. 2021
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.
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Image Analyst
am 3 Apr. 2021
Bearbeitet: Image Analyst
am 4 Apr. 2021
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
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the cyclist
am 3 Apr. 2021
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.
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