Parameter Expression Note

[Bertrand Kim]

Helo everyone

This post is a Searchable note for Prameter Expression

 

Arithmetic Operator

1) equal, same, identical, matching : ==

2) above, grather than, exceeding, over : >

3) under, below, less than : <

4) more than, not less than : >=

5) less, not exceeding, not more than : <=

 

Kim

Edited October 15, 2022 by Bertrand Kim

[Bertrand Kim]

Suppression parameter Value 0 = Unsuppress

Suppression parameter Value 1 = Suppress

Edited September 21, 2022 by Bertrand Kim

[Bertrand Kim]

Edited November 29, 2022 by Bertrand Kim

[ASPEER]

Kim, default units in the parameter table is meters, if you specify a unit then it will use that unit for that particular variable. The units column is the display units for the evaluated expression. Scalar values are unitless and as such are converted to default units (meters) before addition or subtraction are performed.

[Bertrand Kim]

Hi ASPEER

Thank you for the reply

There is someting confusing me every seconds

 

In test11

1 + 1mm = 1001 mm ( I understand it as your explaination )

In test13

If I entered 1 * 1mm, it should be 1000 like in test11

In test14

I entered 1 / 1 mm, the result is 1000000 like in test34

 

It is understandable that it can not be fixed becuase the customer's previous works. But it's clear that I can not remember these rules.

Maybe I should go back to elementary school 

 

Kim

[ASPEER]

For test 13, that is working as it should, you are multiplying a scalar (unitless) by a length.

For test 14, that is a bit odd, however I suspect it is because they expect the numerator to always have units. The result is exactly as expected for 1m/1mm=Xmm if you consider the conversions done, ie 1m/0.001m=1000m * 1000=1 000 000mm.

[Bertrand Kim]

Hi ASPEER,

Yes I understand for test 14 

But look at test24

The parameter name [One] is 1 Millimeter

So the Expression and the result in test24 must be "1mm / 1mm = 1"

However the value was 1000

And the value of 1mm / 1mm is 1000 too

 

Kim

[ASPEER]

That looks like something one of the devs should look at, but if I were to guess I would say that it expects the denominator to be a scalar so it is converting 1mm to default units then to scalar.

[Bertrand Kim]

I still don't get it perfectly, and I'll give my missile to the first person who explains test24 to me in a way that makes logical sense. 

 

Kim

[ASPEER]

Kim, it looks like the issue is with the units. Test23 has units of mm2 but it looks like the conversion from default units (m) to mm only accounted for linear units (m => mm) rather than area units (m2 => mm2). Test24 is unitless and has been converted to mm.

[Bertrand Kim]

Great ASPEER! I've sent a missile!