Equations in SW2005

Mike Wilson's Curve Drive Animation
http://www.mikejwilson.com/solidworks/solidworks_files-02.htm

If you run it (CTRL-Q) in SW2005, it works fine. If you edit the equations,
it tells you this:

"The following sets of equations define the same parameters

"Angle@Wheel Rotation "=IIF("Angle@Wheel Rotation
">360,9,"Angle@Wheel Rotation ")
"Angle@Wheel Rotation "="Angle@Wheel Rotation
"+5

"Distance@"="Distance@"+.05
"Distance@"=IIF("Distance@">12.65,.003,"Distance@")

Only the last equation in each set will be applied."

Ok, fine, but it disables some of the equations so it doesn't function any
more. I tried the same thing in SW2004, got the same message, but it didn't
disable any of the equations. Any thoughts out there? Anyone else try this
and see the same thing?

WT

 

I experienced the same problem with equations.

After defining 2 equations with the same dependent variable (left side
of equation), an error message appeared. The error message said that
the last two equations defined the same variable and only the last one
would be applied. When going back to edit/display the equations, the
first equation defining the dependent variable was suppressed. The two
equations used if statments(iff), so that only one would be true at any
time. I was looking at the ship-in-a-bottle wave equations trying to
recreate my own waves.

I wanted to rewrite the equations with a nested in one line in the
equation box, but am unsure how. I observed the unaltered equations to
work on rebuild as well. So I believe that the error comes from an
error check routine that has been added and runs when leaving the
equation routine. I wasn't able to think of a solution.

Does anyone have a way to do a nested if in the equations?
Should this be done in a macro?
Is there a way to do a switch statement? (a=1;do x,a=2;do y;...)
Is there a good list or reference for the VB functions to be used in
equations?

Should we just ask SW to make this error check a warning? or ask user
before suppressing?

Wayne, I wish I had more answers than questions.
SW 2005 sp0.0

Blair

 

I saved the below post a while back. Not sure if the author was Mike J.
Wilson or Philippe Guglielmetti. Personally, I use Design Tables
instead of Equations.

Hope this helps,
Ken
like -> Used as an "equal to" (why can't I use "="!)
<> -> Used as a "not equal to" (stopped working?)
and -> Can be used
or -> Can be used
& -> Used to "Concatenate" (add two strings)

hey! but they're all Visual Basic keywords! This means SW equations use
either VBA or what's called the "Script Control" (the one we use in
www.soliplus.com/mathsurf/ to make programmable shapes)

"like" compares strings in VB... strange...

not -> not sure what it does? logical negation
eqv -> not sure what it does? logical equivalence operator (very
seldom used)
imp -> not sure what it does? logical implication operator (very
seldom used)
mod -> not sure what it does? modulus, or remainder of a division
xor -> not sure what it does? exclusive OR

now, once you know that "true" = -1 in VB and "false" = 0, you can
write
equations like:
"D3@Sketch1"=-("D1@Sketch1">"D2@Sketch1")*"D1@Sketch1"-(not
"D1@Sketch1">"D2@Sketch1")*"D2@Sketch1"
which sets D3 to the largest of the D1 and D2 values....
Nice, isn't it ?
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