Returns a matrix with the specified number of rows and columns
where each element is randomly chosen from a Gaussian ("normal")
distribution with mean 0.0 and standard deviation 1.0.
Returns a vector of the given size where each element is randomly
chosen from a Gaussian ("normal") distribution with mean 0.0 and
standard deviation 1.0.
Returns a matrix with the specified number of rows and columns
where each element is randomly chosen from a uniform distribution
on the interval [0, 1].