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# problem with manipulation a vector randomly

Asked by Rica on 12 Dec 2012

hi! i usid bsx function to generate fro a vector a matrix by ading a random number. my problem: this function add to the whole vector a random number, but i want to add or substract to each number of the vector a random number. how could i manipulate this statement to generate the matrix?

MM is aknown vector
M=bsxfun(@plus,MM,10*sign(randn([1 1],27,20)).*rand([1 6],27,20))

thank you

## 1 Comment

Azzi Abdelmalek on 12 Dec 2012

Can you explain?

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Answer by José-Luis on 12 Dec 2012
Edited by José-Luis on 12 Dec 2012

You could still use bsxfun, but instead of creating a vector of random numbers, if I understood correctly, you might need to create a matrix of random numbers to add it to the vector. Say MM is a column vector of size m1 and the random matrix is of size m1 x n1

m = 10;
n = 25;
MM = randi(m,10,1);
M = bsxfun(@plus,MM,randn(m,n));