I have an array M=(1000000,12,2,2).
How do I write it to a file to work on later?
save('filename.txt','M','-ASCII')
doesn't seem to work...
Regards,
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2 Answers
Why not save it as a mat file (binary) ?
save('filename.mat', 'M' );
afterwards you simply load it
% some code ...
M = [];
load( 'filename.mat' );
% now you have M
% code handling multi-dim M
Comments
1) just like the answer from @Shai, you can save it to be mat file
2) if you want to save it to be txt file, you can do it in this way:
clear;clc;
M=[1000000,12,2,2];
dlmwrite('a.txt',M); % save M to file--a.txt
type a.txt; % print content in a.txt
M = dlmread('a.txt'); % load content of a.txt to M and then you will have 'M=[1000000,12,2,2]'
3) you can also use fopen, fprintf, fclose to save a matrix to a file. check this post: How to save data in .txt file in MATLAB
4) for the code you have, I tested it. It works. The Matlab version I have is R2011b. please check your code again. The code I used to test is as follows:
clear;clc;
M=[1000000,12,2,2];
save('b.txt','M','-ASCII');
clear;clc;
M = load('b.txt','-ASCII');
4 Comments
HCAI
If I use
load I get a struct rather than a straight forward array don't I?
tqjustc
@user1134241 nope, I tested it. if you load it using 'M = load('b.txt','-ASCII');', it will give 'M=[1000000,12,2,2];' directly. If you saved it to be a mat file and load it using 'a=load('M.mat')', you will get a struct. One is mat file and one is txt file. They are different.
HCAI
For this type of operation are there any benefits of one over the other?
tqjustc
@user1134241 For MAT file, it can save complex data structure, for example struct data. But txt file cannot. Meanwhile, for txt file, it is memory-efficent. For example, when I save 'M=[1000000,12,2,2]' to be txt file, the size of file is 66bytes. But for mat file, the size is 181 bytes.