writematrix: how to get formatted txt-output?

I have been using "dlmwrite" to get nicely formatted text output:

dlmwrite('file.txt',M,'delimiter',' ','precision','%10.2f');

txt-file looked like:

100.00     0.00    4500.00
  0.00     1.00      38.29
  1.00     1.00      38.22

As "dlmwrite" is not recommended anymore, I tried to use "writematrix" instead. But it does not have "precision" parameter:

writematrix(round(M,2),'file.txt','Delimiter',' ');

txt-file is not so nicely formatted:

100 0 4500
0 1 38.29
1 1 38.22

That's a problem especially with bigger matrices, as offset between lines is getting bigger and bigger, and I can not recognize columns anymore. Is there any way to fix this?

Answer 1

[Stephen23]

M = [100,0,4500;0,1,38.29;1,1,38.22]

M = 3×3

1.0e+03 * 0.1000 0 4.5000 0 0.0010 0.0383 0.0010 0.0010 0.0382

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S = join(compose("%10.2f",M),'');
writelines(S,"test.txt")

Checking:

type test.txt

    100.00      0.00   4500.00
      0.00      1.00     38.29
      1.00      1.00     38.22

Answer 2

[Aquatris]

Use 'tab' delimiter option instead of single space.

M = [100 0 4500;0 1 38.29;1 1 38.22];
writematrix(round(M,2),'file.txt','Delimiter',' ');
type('file.txt')

100 0 4500
0 1 38.29
1 1 38.22

writematrix(round(M,2),'file2.txt','Delimiter','tab');
type('file2.txt')

100	0	4500
0	1	38.29
1	1	38.22

Answer 3

[SACHIN KHANDELWAL]

Hi,

Seems that you want to use 'precision' as key value pair with 'writematrix'. I think this is currently limitation. I found the following workaround working :

M = magic(5)*pi; % Create a 5x5 matrix of numeric values
s = num2str(M,3); % create a character array that represents the numeric values in "M" with 3 significant digits
T = str2num(s); % convert "s" back into a numeric matrix.
writematrix(T,'myFile.txt','Delimiter',' ');

[Stephen23]

In case anyone is wondering:

M = [100,0,4500;0,1,38.29;1,1,38.22]

M = 3×3

1.0e+03 * 0.1000 0 4.5000 0 0.0010 0.0383 0.0010 0.0010 0.0382

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s = num2str(M,3); % create a character array that represents the numeric values in "M" with 3 significant digits
T = str2num(s); % convert "s" back into a numeric matrix.
writematrix(T,'myFile.txt','Delimiter',' ');
type myFile.txt

100 0 4500
0 1 38.3
1 1 38.2