Get current global random number stream
the current global random number stream.
stream = RandStream.getGlobalStream
randn all rely on the same stream of uniform
pseudorandom numbers, known as the global stream.
rand draws one value from that stream to generate each uniform value it
randi draws one uniform value from that stream
to generate each integer value it returns. And
randn draws one or more uniform values to generate each normal value it
returns. Note that you can also specify a specific random stream from which
randn draw values by creating a
RandStream object and passing it as the first input argument.
rng function is a shorter alternative for
many common uses of