In Matlab, many blocks have parameter called seed. What is it? What if we change this parameter? Can anyone explain in detail please?
Sure. Roughly, seed is a nonnegative integer which serves as a unique identifier of a pseudo-random sequence. That is, for each particular seed there is a unique pseudo-random sequence ("pseudo" means it actually repeats itself for obvious reasons of practical realizibility). It is used, therefore, as a parameter of a pseudo-random generator.
If you really want to understand how it works, look at the code. Say, Mersenne twister (which is among pseudo-random generators used in MATLAB) may be found here:
http://de.mathworks.com/matlabcentral/fileexchange/6614-mersenne-twister
http://wiki.tcl.tk/13121
Computers can't generate truly random numbers . To get pseudo random numbers the simplest algorithm is http://mathworld.wolfram.com/LinearCongruenceMethod.html
"xn" is the seed value based on which next random value is estimated. "seed" is the first value you give so that random numbers are unique (eventually repeated) . So if seed repeats then you end up getting a know sequence. Hence choice of seed is important -prime numbers !
The seed allows your "random" simulations to be reproducible. And if you don't like the results you get, just change the seed and try again :).
Usually when you write a program to generate random numbers based
on a starting seed. Once you set the seed in the block
parameter dialog box, you'll get the same stream of random
numbers each time you run the simulation. This is important
for repeatability of the results. If you change the seed to
another value and rerun the simulation, then you'll get
a different stream of random numbers.
Hello everyone, can you tell me how to create a pink signal? what values should be given for mean, variance, seed and sampling time? Thanks a lot to you
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