Error using rand Size inputs must be scalar.

Hi, I am trying to use rand , but Im getting erros Size inputs must be scalar.

I am almost new at matlab and was wonder how to fix that problem

D = 2 ;
g =1000;
sigma = 1;

for i=1:g
	r = rand(0,sigma^2,[D 1]);
       %...
end

Answer 1

[Walter Roberson]

When you talk about sigma^2 you are talking about normal distribution (typically) not uniform distribution such as rand() produces.

I suspect you want to call normrnd() rather than rand() .

[Cesar Ramirez]

Thanks so much!. It worked.

But now I cant make xh equal to r and xp. Matrix dimensions must agree

xp = xl+(xu-xl).*rand(0,1) ;

xh = xp + r;

[Walter Roberson]

rand(0,1) means that you want an array with 0 rows and 1 columns .

Perhaps you want normrnd(0,1) ?

The code lines you are using are like what you would use to create a uniform random number in the range xl to xu . If you want to do that once for each member of r, then

xp = xl + (xu-xl) .* rand(size(r));
xh = xp + r;

[Cesar Ramirez]

Thanks again ! haha