Error using rand Size inputs must be scalar.

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Cesar Ramirez
Cesar Ramirez 2019-2-25
评论： Cesar Ramirez 2019-2-25
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

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Walter Roberson
Walter Roberson 2019-2-25
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() .
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Walter Roberson
Walter Roberson 2019-2-25
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;

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