a=rand(400), this function generates 400*400 random matrix a,how could generate matrix a with specified mean and variance.

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vipul utsav 2012-12-24

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a=rand(400), this function generates 400*400 random matrix a,how could generate matrix a with specified mean and variance in matlab.

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vipul utsav 2012-12-24

what do you mean? and what you feel

Image Analyst 2012-12-24

If a poster honestly admits it's homework, then we will give hints rather than full solutions so they can't be accused of plagiarizing, and won't feel guilty about turning in someone else's code as their own. It appears that you imply this is not your homework, so don't worry about it.

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Andrei Bobrov 2012-12-24

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编辑：Andrei Bobrov 2012-12-24

在 MATLAB Online 中打开

m - your mean

s - your variance

size_matrix - size of your array < a x b > , size_matrix = [a,b];

fun1 = @(m,s,size_matrix) m + sqrt(s)*randn(size_matrix)

use function fun1, eg:

>> fun1(1,2,[3,2])

please read about randn

if you have Statistics Toolbox, use function normrnd:

>> normrnd(m,sqrt(s),size_matrix);

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vipul utsav 2012-12-24

编辑：vipul utsav 2012-12-24

this is different question compared to you answered (homogeneous area...)

and i got solution

Image Analyst 2012-12-24

Yes I know I answered a different question from you in a different discussion but the comment I made here was related to this discussion. Usually people care about what shape their noise distribution takes and I was just wondering why you don't, because it has a huge impact on the results. But whatever, as long as you think you have a solution....

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