NX5 will not accept less than or greater than expression

[Tripton]

I am trying to create a conditional expression and find that using the less than symbol gives the following error: Dimension mismatch (binary operation)
Attempt to use the "<" operation on the Length and Angle
Expression: arm_angle = if(arm_length<100)(102)else(90)

This expression was taken right out of CAST. It will accept the = symbol but not the < or > symbols.

Any help would be greatly appreciated. Thanks

 

[JohnRBaker]

I can't explain exactly why this works this way, but you can't mix units inside a logic command. So the workaround is to create another Expression which has units 'Constant' equal to your Length Expression and then use THAT expression in the logic command. I know it feels like a bit of a kludge, but it's the best that I can offer you.

John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

http://www.plmworld.org/museum/

To an Engineer, the glass is twice as big as it needs to be.

 

[Tripton]

Thank you so much John. I don't know how I missed making the arm_length expression constant in CAST. It makes perfect sense now and worked out perfectly. It's little things like this that really make NX overwhelming to some of us new guys. I struggled for hours and even recreated the model several times before your help. Again, thanks so much.