Empirical Distribution returns "unknown values"

Question

question

Sebastian Hemmann asked Aug 24 2022 at 1:55 PM Jordan Johnson edited Aug 26 2022 at 8:58 PM

Empirical Distribution returns "unknown values"

Hi,

in the model: "Empirical_Bug_2022-2-1.fsm" I´ve implemented a weighted discrete Empirical distribution. I used it in another model and it throwed some exceptions. As far as I already figured out it is returning "unknown value" from time to time.

What am I doing wrong?

Empirical_Bug_Flexsim22-2-1.fsm.png

just erase the .png

Software Version:

FlexSim 22.2.0

empirical distribution

empirical-bug.png (59.9 KiB)

empirical-bug-flexsim22-2-1fsm.png (35.4 KiB)

· 3

Ralf Gruber ♦ commented · Aug 24 2022 at 5:09 PM

Line 7 shows a weight of "0.00". Can this cause the problem?

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Felix Möhlmann Ralf Gruber ♦ commented · Aug 25 2022 at 6:54 AM

The issue seems to be caused by weight values 0 < x < 1.

The distribution in the screenshot below returns 2 most of the time and very rarely "unknown type". It looks like the row from which the value is returned somehow increases by 1, so 2 is returned instead of 1. And if the second/last row should be returned the row number becomes out of bounds.

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1661410434429.png (29.6 KiB)

1661410481383.png (7.2 KiB)

1661410483430.png (7.2 KiB)

Sebastian Hemmann Ralf Gruber ♦ commented · Aug 26 2022 at 10:18 AM

No, I´ve changed the value and it still happened. Also a 0.00 should be a valid weigth.

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Answer 1 · 2022-08-26T20:11:19Z

Jordan Johnson answered Aug 26 2022 at 8:11 PM Jordan Johnson edited Aug 26 2022 at 8:58 PM

This looks like a bug. It is caused by improperly handling non-integer weight values. I'll add it to the dev list.

Answer 2 · 2022-08-26T12:19:53Z

Steven Hamoen answered Aug 26 2022 at 12:19 PM Sebastian Hemmann commented Aug 26 2022 at 3:23 PM

@Sebastian Hemmann Might this be the same problem? https://answers.flexsim.com/questions/116175/new-empirical-function-bug-or-by-design.html

· 3

Jason Lightfoot ♦♦ commented · Aug 26 2022 at 2:47 PM

Or this one which suggests it uses integer values.

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Sebastian Hemmann Jason Lightfoot ♦♦ commented · Aug 26 2022 at 2:52 PM

Am sadly not allowed to see this.

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Sebastian Hemmann commented · Aug 26 2022 at 3:23 PM

Hi @Steven Hamoen it´s looking a bit different but anyhow if it is the same issue it was not solved in this release.

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