Problem with decide in process Flow

Question

question

Brian R2 asked May 29, '19 Matthew Gillespie answered May 30, '19

Problem with decide in process Flow

Hello, I have a problem with the Decide in the process flow, the condition is not completed successfully. The token go throw that condition and pass.

Software Version:

FlexSim 19.0.3

process flow

1.png (35.5 KiB)

2.png (18.6 KiB)

3.png (16.6 KiB)

· 2

Joerg Vogel commented · May 30, 2019 at 07:28 AM

NULL as a result of a pull clause can be the expression that there is something wrong. The red triangle tells you this.

Please close FlexSim, start FlexSim again and run the model again. If you get the result NULL with the red triangle in left upper corner again then you should check your filter clause where you assign the label value. Please prepare your list in the manner that you can get a valid result of the pull activity to check if the filter clause works.

And maybe you can attach a model. Or a smaller extract of your model still behaving strange. Thanks!

0 ·

Brian R2 Joerg Vogel commented · May 30, 2019 at 12:56 PM

Hi, yes, I put the pull from list a conditional request in the request number and require number. I go to attach my model to show you.

modelo.fsm

Thanks.

0 ·

modelo.fsm (251.8 KiB)

Answer 1 · 2019-05-30T19:26:00Z

Matthew Gillespie answered May 30, '19

The issue is that the value on the estiba1 label is not actually NULL. It is a bug that the labels panel writes the word NULL in there. It should only be showing an empty cell with the red triangle in the corner that indicates no data.

The reason it's not NULL is that NULL means 0. However, the label has no value, not even 0. It's value is actually nullvar.

To fix that decide you should change the condition to

!token.estiba1

The exclamation mark (!) negates things and will make both nullvar and NULL turn into a true value (1).

Alternatively you could say

token.estiba1 == nullvar

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