Nesting ternary operators?

Henk_de_Vlaam

Is it possible to nest ternary operators in a variable definition?

I tried this: #D<301mm?3:#D<451mm?4:#D<501mm?5:#D<601mm?6:6. However it gives an error.

Is there another way?

ilya_baran

I think it should work, though I would recommend parentheses.  Can't tell what's actually wrong without a public doc link.

Even better though, I'd recommend writing a function in a feature studio for this, so you can use if statements, etc.  See my comment here: https://forum.onshape.com/discussion/comment/18476#Comment_18476
The custom function could be pretty generic, taking a map as an input, working like:
#rangeValue(#D, { 301mm : 3, 451mm : 4, 501mm : 5, 601mm : 6 }, 6)
Post if you need help writing this.

kevin_o_toole_1

Your exact expression works for me in this example (see "Instance count" in linear pattern 1):
https://cad.onshape.com/documents/f050e58e3939d5ddfe8074cd/w/7e67687934f04f4780fc4590/e/c543bd2493c92929656cd6ba

Can you share a document where the error is occurring?

ilya_baran

I think it should work, though I would recommend parentheses.  Can't tell what's actually wrong without a public doc link.

Even better though, I'd recommend writing a function in a feature studio for this, so you can use if statements, etc.  See my comment here: https://forum.onshape.com/discussion/comment/18476#Comment_18476
The custom function could be pretty generic, taking a map as an input, working like:
#rangeValue(#D, { 301mm : 3, 451mm : 4, 501mm : 5, 601mm : 6 }, 6)
Post if you need help writing this.

Henk_de_Vlaam

@kevin_o_toole_1 and @ilya_baran,

I extracted the features that give the error in a new part studio:

https://cad.onshape.com/documents/f74debfb833b8135e5c28259/w/ab516eb7d8c390bb970f1a59/e/43762454ad2feecb458085a8

The ternary operator is driven by the configuration variable Dia onder.

The part that comes to you is without error. However when you replace the number 401 by the wished value 451 in the variable #Spaken there will be an error. Also when inserting the intended #D_onder<301mm?3:#D_onder<451mm?4:#D_onder<601mm?5:6 the error remains.

--- Edit [20180930] ---
I changed the model and now the value 451 is excepted. However the full ternary range still gives an error.
Is it possible that the use of a configuration variable is the reason of this error? 

Henk_de_Vlaam

@kevin_o_toole_1 and/or @ilya_baran,

Is there an answer for the September 29 topic?

Henk_de_Vlaam

The problem has been solved by using parentheses.

@ilya_baran, you mentioned already the parentheses, but I did not know how to use them. The contribution of @brian_brady in topic https://forum.onshape.com/discussion/7128/a-few-expression-tips brought me to the solution.

So, I changed #D_onder<301mm?3:#D_onder<451mm?4:#D_onder<601mm?5:6
to
#D_onder<301mm?3:(#D_onder<451mm?4:(#D_onder<601mm?5:6)).

@kevin_o_toole_1, your solution to add the ternary operation directly to the pattern "Instance count" also works, but with me only with the parentheses (see "Circular pattern OK" of https://cad.onshape.com/documents/f74debfb833b8135e5c28259/w/00f467661c0e8c373c355f2a/e/43762454ad2feecb458085a8).

Thank you all.