if demand is a distribution

[sally]

hello,

i have a problem,

if i want to simulate a event for 100 days,

and i have a variable "demand", i want to set it as a normal distribution in the whole period....it means the demand is start at 0, and have the highest in the middle time, then in the end(100) is 0,

how to set this up ?

hope you can know my meanings...

thank you ..

[nikvyas]

There is already a function for Normal distribution (as well as other distributions) called RANDOM NORMAL

[sally]

but

when i use normal distribution

it means the demand is a normal,,

not like the attachment..

attachment 1 is the one when i use normal distribution

and the attachment 2 , in the graph,,,,the figure is the one which i want to have .

hope some one can help me

[sally]

fyi

[Administrator]

Can you post the attachments you mention?

Tony.

[bob@vensim.com]

I am not sure what you are after but you can use

normal val of x = 1/sqrt(2*3.14)*exp(-x^2/2)
x = Time

[sally]

does it mean i have to set up a variable name x

then to key in the formula?

[sally]

sorry, i have try it ,,

but it not what i want

my hope is " in my simulate time(100weeks), my deamnd's figure is like the normal distribution

so , at frist , the demand is low,,in the middle time,,,demand is on the top,,,and ,,,in the end, deamnd is become small...

pls, hope some one can help me