Why can't I use crand() in matlab

It is supposed to generate a complex random number, and it worked on my friend's PC, but not mine.

Answer 1

[per isakson]

crand is in Robust Control Toolbox

>> which crand -all     % -all toolboxes that are installed on my PC
C:\Program Files\MATLAB\R2018b\toolbox\robust\rctutil\crand.m

>> help crand
  out = crand(dim1,dim2)
 
    Complex random matrix generator: generates a complex,
    random matrix with a uniform distribution of dimension
    DIM1 x DIM2. If only one dimension argument is given,
    the output matrix is square.
 
    See also crandn, rand, randn and sysrand.

But as Star Strider says, it's not in the MATLAB documentation

Star Strider's proposal is worth better than being deleted. Try this:

crand = @(m,n) randn(m,n) + 1i*randn(m,n); 
C = crand(2,2) 

Experiment to get different results, including with different random number generator functions