Set global random number stream
prevstream = RandStream.setGlobalStream(stream)
prevstream = RandStream.setGlobalStream(stream) designates
the random number stream, specified as stream,
to be the global stream that the rand, randi, and randn functions
draw values from. It returns the previous global random number stream
as prevstream.
rand, randi, and 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 returns. 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 there are also rand, randi, and randn methods
for which you specify a specific random stream from which to draw
values.
The rng function is a
shorter alternative for many common uses of RandStream.setGlobalStream.