Save an array with multiple rows and columns in .txt file

Hello everyone,

my question is very simple. I have a big array (30001x2434 elements), and I want to save all the data in .txt file. Which is the correct syntax for that so that the final file respect the distribution of my current array? It would be great if I can directly save that file in a folder that it is inside the workspace where my script is.

Answer 1

[Star Strider]

I would use the writematrix function (R2019a and later). Another option is dlmwrite (and its friends) if you do not have writematrix.

[Richard Wood]

Hi. I have tried this:

fid_squared_dmdt_inelastic=fopen('Squared_dmdt_inelastic.dat','wt');
fprintf(fid_squared_dmdt_inelastic, '%d \n',[squared_dmdt_inelastic]);
fclose(fid_squared_dmdt_inelastic);

But I am not sure on what I should put in '%d \n'. Also I do not know how to incorporate the fact that I want to save the file in a folder inside my workspace.

[Richard Wood]

Just a question about writematrix function. Does it save the elements of my matrix with the same precision as that which appears in MatLab? Does it maintain scientific notation when it shows MatLab like this?

[Star Strider]

I have no idea what you are doing in the earlier Comment. Please see the documentation I linked to for the writematrix function. It will tell you how to use it.

‘Just a question about writematrix function. Does it save the elements of my matrix with the same precision as that which appears in MatLab?’

It appears to, yes.

‘Does it maintain scientific notation when it shows MatLab like this?’

If it needs to, yes. The documentation does not mention that specifically.