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# Cannot resolve an expression to make a dimension dependent of 3 variables. Someone can help ?

Member Posts: 64 EDU
I'm not familiar with scripting. Maybe this is a very simple problem.
PLease see the attached PDF file ...
La simplicité est la sophistication suprême.
Léonard de Vinci
Tagged:

• Member Posts: 64 EDU
It Works, Thank you.
And I found another way to do it with a conditional: (#ObstaAv>0?0:#Diff/#ObstaArr) in
Thanks again !
La simplicité est la sophistication suprême.
Léonard de Vinci

• Member, Developers Posts: 67 ✭✭✭
You have incompatibe units.
1st equation ([in]/[in])*[in] - ([in]) = [in]-[in] = [in] OK
2nd eq: ([in]/[in])*[in] - ([in]*[in])*[in] = [in] - [in]^3  KO
3rd eq: ([in]/[in])*[in] - ([in]*[in]) = [in] - [in]^2  KO

So
2nd eq should be: (#Diff/#ObstaArr) in-(#Diff*#ObstaAv)/in
• Moderator, Onshape Employees, Developers Posts: 1,639
@francois_boulet

#Diff and #ObstaAv both have "in" as their unit already.  When multiplied together, the unit becomes in^2 (as expected for multiplying two lengths together).  Your expression will work if you do:
((#Diff * #ObstaAv) / in)

but I suspect that what you actually meant to do is have ObstaArr and ObstaAv as unitless numbers instead of lengths?  Then your expression would look like:
(#Diff / #ObstaArr) - (#Diff * #ObstaAv)

But that's just a guess, and I can't tell your design intent.  You can set a variable to a number instead of a length using the "Number" option at the top:

Jake Rosenfeld - Modeling Team
• Member Posts: 64 EDU