IF function in Parameters

[spi82UU6]

It would be a very good thing if it was possible to use the "IF" function when specifying the values ​​of the parameters. In many cases this would help the work. There are components where, for example, the pattern should be bound to a condition, this is very difficult or not possible at all without the "IF".

[kacper.suchomski]

Hi

It's possible. You can do it all with iLogic.

iLogic allows both assigning conditional values ​​and linking parameters between files, which is useful e.g. in the above-mentioned patterns.

[johnsonshiue]

Hi! There is a way to write a parametric expression to do "if, then" but it largely depends on the complexity of the condition. Please share an example of the desirable "if, then." I would like to see if there is a parametric expression solution without using an iLogic rule.

Many thanks!

[spi82UU6]

Hi,

I need only a simple if/then solution.

A = 10 mm
B = if "A=10" then "B=12" else "B=15"

Or

B = if(A=10;12;15) like in Excel 🙂

That's all.
Have a nice day,
Sandor

[kacper.suchomski · Accepted solution]

If A=10 Then
B=12
Else
B=15
End If

You can paste this code into an iLogic rule.

Of course, you must replace the symbols with the actual names of the parameters.

[aurel_e · Accepted solution]

Other users have shown previously creative ways to compensate for that...

In your case the B would be:

( 1 ul - sign(abs(A1 - 10 mm) - 0.001 mm) ) * 12 mm + sign(abs(A1 - 10 mm) - 0.001 mm) * 15 mm

[johnsonshiue]

Hi! There is a simpler equation to use for this case.

B=sign(( A / 1mm - 10 ul )) * 3mm + 12mm

Many thanks!

[aurel_e]

@johnsonshiue This is resulting 12 for A<10.

[SBix26 · Accepted solution]

In @johnsonshiue 's equation, just add the absolute value:

B=sign(abs( A / 1mm - 10 ul )) * 3mm + 12mm

B is 15 unless A is exactly 10.

I, too, thought that the sign function would return -1 for negative, 0 for 0, and +1 for positive, but that's not the case; it returns +1 for > 0, 0 for <= 0

---

Sam B

Inventor Pro 2026.0.1 | Windows 11 Home 24H2

[spi82UU6]

Thank you so much!