confirm rand

Fri, 11 Dec 2009 04:44:09 -0700

Hi,
I am using Matlab version 6.1.
I am using the Rand function to generate random numbers but would like to clarify a number of things.
Is RAND based on the CPU Clock cycle?
Also, if I use
rand('seed',fix(100*(sum(clock))));
does this ensure my seed is changed every time?

Thanks

Re: confirm rand

Sat, 12 Dec 2009 16:12:15 -0700

I guess yes, the random numbers have something to do with the internal clock.

Besides, this is taken from the on-line help for version 7.0.1
(sorry, I don't have your version)

Return RAND to its default initial state.
rand('state',0)

Initialize RAND to a different state each time.
rand('state',sum(100*clock))

Save the current state, generate 100 values, reset the state,
and repeat the sequence.
s = rand('state');
u1 = rand(100);
rand('state',s);
u2 = rand(100); % contains exactly the same values as u1

.
.
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