Parameter Syntax Help

[oregondunerz]

Good morning.  I am trying to design a parametric tab and slot box and I am running in to an expression syntax error - the expression is shown in 'red' color and I cannot click OK.  I think I am close, but for the life of me I cannot figure this out.

I have 3 different parameter;

- myWidth = 4"

-myFinger = .75"

-nInstancesW = if (myWidth <= 4) then 2 else (floor(myWidth / myFinger))

Then, in my rectangular pattern dialogue;

-Quantity = nInstancesW / 2

Distance = myWidth - myFinger * 3

Essentially what I am trying to accomplish is if the width of my box is less than or equal to 4" than I only want to have 2 instances of my rectangular pattern (the tabs).  See image attached for reference.  The middle finger is the one I am trying not to include if the 'myWidth' is less than or equal to 4.  Hope this makes sense and hopefully I am close to the proper solution.  I feel like it may just be a syntax error but I have tried several different methods and getting the same result.  --and yes I am aware that there are websites to general this sort of tab and slot box but it's important for me to learn how to do it myself.  Thanks for any help!

[JoshuaOrr · Accepted solution]

1. The syntax for the "if" function is:

if(<condition>;<then>;<else>)

so you would write

if(myWidth <= 4";2;(floor(myWidth/myFinger)))

I have this page bookmarked because I forget every few days: https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-76272551-3275-46C4-AE4D-10D58B408C20 

2. Another issue can come from trying to put a non-integer into the "Count" field of a pattern feature. It looks to me like your current expression could result in a decimal if "nInstances" is odd, so you may have to include another round/floor/ceil function after you divide by 2.

[oregondunerz]

That worked PERFECTLY!  Ugh, I absolutely hate getting stuck on 'easy' stuff like this for hours, thanks again for all the help!