Decide activity by percentage bug?

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David Besson asked Nov 10, '16 Joerg Vogel edited Nov 10, '16

Decide activity by percentage bug?

Hello,

In process flow, I set a "Decide" activity to send tokens to downstream activites by percentage.

But it seems that the distribution is not working correctly. In the model attached for example, the tokens seems to be sent to the first connector 1 point more than the percentage specified.

Is it a bug?

Thanks!

q-pf-decide-by-percentage-bug.fsm

Software Version:

FlexSim 16.2.1

process flow bug

capture.png (31.5 KiB)

q-pf-decide-by-percentage-bug.fsm (13.8 KiB)

· 4

Joerg Vogel commented · Nov 10, 2016 at 03:05 PM

If you look into the source code, you find that the distribution has a discrete result range [0..100]. That way is zero a possible result of the range and some items are going to the output port 1. To be exact 1/101 of all items will go to the output port number 1.

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David Besson Joerg Vogel commented · Nov 10, 2016 at 03:28 PM

Is it not a little bit pernicious?

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Joerg Vogel David Besson commented · Nov 10, 2016 at 03:50 PM

Maybe, the hint should advise not to use 0 percent as a value.

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Answer 1 · 2016-11-10T16:53:38Z

Phil BoBo answered Nov 10, '16

Yes, this is a bug. I'll add a note to the development list.

For now, if you change line 8 to

double randomnum = uniform(0, 100, stream);

then it will behave correctly.

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