random uniform

gastoncoma · Post by **gastoncoma** » Thu Aug 27, 2009 2:42 am

Hi guys, trying to understand the way of using this random uniform equation.

I understand that:
RANDOM UNIFORM( {min} , {max} , {seed} )

min is the minimum value and max the maximum value. For example 0, 1 but what is the seed thing about??? It's driving me creazy as I read the help and it obviously doesn;t help me at all!!

I don;t need any third number, I just want a random number between 0 and 1

Post by **Administrator** » Thu Aug 27, 2009 6:22 am

The noise seed is useful when doing monte carlo simulation. Just create a parameter called NOISE SEED and set it to any value and use it in all RANDOM *** functions.

gastoncoma · Post by **gastoncoma** » Thu Aug 27, 2009 6:24 am

so what value should I use? a zero, a five, any number?

Lee Jones · Post by **Lee Jones** » Thu Aug 27, 2009 9:12 am

If you are using NOISE SEED in the model, set the value for "seed" in random_uniform to "0"

bob@vensim.com · Post by **bob@vensim.com** » Thu Aug 27, 2009 10:42 am

Always set the last argument (which is actually a stream ID not a seed) to 0 unless you have a specific need to create separable random number streams (a rare requirement). Add the constant NOISE SEED to the model if you want to select different noise realizations for sensitivity simulations or other reasons.