topic Re: Generating token based on probability and distribution in FlexSim Forum

Generating token based on probability and distribution

Vns — Sun, 29 Jan 2023 11:48:11 GMT

[ FlexSim 22.0.8 ]

Hi -

im not quite sure if there is a way to generate tokens based on the following conditions:

Set a probability for token creation for each hourly slot. In the event a token where to be created set a randomize quantity distribution to be generated.

Time interval	Probability	Qty
0600 - 0659	20%	1 - 4 (2)
0700 - 0759	50%	1 - 4 (1)
0800 - 0859	10%	1 - 4 (4)

Thanks in advance.

Re: Generating token based on probability and distribution

moehlmann_fe — Sun, 29 Jan 2023 16:28:13 GMT

To use different expressions for the hours of the day, it would be best to use the "Date Time Source".

One way to either create no tokens or a random number is to just multiply two distributions together. "bernoulli" can be set up to either return 1 or 0 with the given probability. So only if it returns 1 will the quantity be something other than 0. The second distribution controls the quantity if it does return 1.

Re: Generating token based on probability and distribution

jason_lightfoot_adsk — Sun, 29 Jan 2023 17:41:10 GMT

bernoulli takes a percentage value not probability - so bernoulli(20,1,0) gives 20% chance of returning 1.

Re: Generating token based on probability and distribution

moehlmann_fe — Sun, 29 Jan 2023 17:56:22 GMT

Right, that's an oversight on my part. Thanks for the correction.

Re: Generating token based on probability and distribution

Vns — Mon, 30 Jan 2023 04:21:47 GMT

Thanks @Felix Möhlmann / @Jason Lightfoot for sharing the inputs.

I can't seems to get the model to run to generate the tokens based on this setup. Is there a step that i missed? probability and distribution.fsm

Re: Generating token based on probability and distribution

moehlmann_fe — Mon, 30 Jan 2023 07:00:23 GMT

Put the expression into the Arrival field at the bottom that appears when you have a table cell selected, not into the table directly. (Writing it into the cell directly interprets it as text, not FlexScript).

In your case the resulting table should look like this:

You only see the first row of the code that gets auto-generated when you type in the expression. This was changed in version 22.2 which my screenshot above is from.

Sorry for the confusion.