How do I create a n by n matrix, randomly filled with only k specific values ; m1,m2,m3..mk where m1, m2, m3..mk are specified
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Example
Say I want a 3 by 5 matrix filled randomly with only 2 particular values 2 and 6
A=
2 6 2 2 6; 6 2 6 6 2; 2 2 6 2 2;
I'm thinking of using a function like Rand and combine it with a round function, any tips/solutions are much appreciated!
-Tarun
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Image Analyst
2016-11-10
编辑:Image Analyst
2016-11-10
Try this:
myNumbers = [2.3, pi] % Whatever
% Find out how many unique numbers there are.
numNumbers = length(unique(myNumbers))
% Create a labeled 3-by-5 matrix with values from 1 to numNumbers
m = randi(numNumbers, 3, 5)
% Now replace each integer label ID of m with the value from myNumbers
for k = 1 : numNumbers
m(m == k) = myNumbers(k);
end
% Print to command window:
m
In the command window you'll see:
myNumbers =
2.3 3.1416
numNumbers =
2
m =
1 2 1 2 2
2 1 1 1 2
1 2 1 1 2
m =
2.3 3.1416 2.3 3.1416 3.1416
3.1416 2.3 2.3 2.3 3.1416
2.3 3.1416 2.3 2.3 3.1416
It's generalizable to any numbers you want to use, not just integers, and any number of rows and columns.
3 个评论
Image Analyst
2016-11-11
That's far simpler. Simply use randi():
m = 2 * randi([0,1], 100) - 1
James Tursa
2016-11-11
If you just want -1 or +1, then see this link:
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