how can I generate a random matrix?
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hello guys, what code can i use to generate a mxn matrix provided that the value is from 1 to x(depending on the desire of user) and the values should be unique from each other. :)
1 Comment
Image Analyst
on 7 Oct 2012
There is a help facility in MATLAB (beyond the Answers forum). It's right there built into MATLAB. For things like this you can use the help documentation. So you can either type "help random" "doc random" into the command window, or click the question mark icon, or (in older versions) get help from the menus. Or you can click in a word in the editor and type F1. For things like this (random) you'd get faster help by using the built-in help.
Accepted Answer
Matt Fig
on 7 Oct 2012
You will of course have to make sure that x==m*n, as you describe it.
f = @(x,m,n) reshape(randperm(x),m,n);
f(20,5,4)
ans =
4 9 12 2
17 1 8 16
19 7 6 18
5 3 14 13
20 11 15 10
3 Comments
Matt Fig
on 7 Oct 2012
Or, if your version of MATLAB supports it:
f = @(x,m,n) reshape(randperm(x,m*n),m,n);
f(43,,10,4)
ans =
40 25 43 16
3 9 11 2
19 36 29 26
37 32 8 27
7 38 12 31
33 41 35 39
22 20 42 1
30 4 24 15
10 17 5 23
28 34 6 21
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