Equation Discoveries II

For those of you who missed part I, here's the
original link...
http://makeashorterlink.com/?S220129A6

I found a few more operators, but I don't know
how to utilize them or what they can be used for.

Does anyone have any suggestions?

Here's my list O' operators...

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)
not -> not sure what it does?
eqv -> not sure what it does?
imp -> not sure what it does?
mod -> not sure what it does?
xor -> not sure what it does?

Here is an example (in SW2004) of a 'pendulum'
type of motion. I used some equations to create
momentum as the pendulum swings to simulate the
effects of gravity...
http://www.mikejwilson.com/misc/pendulum.zip

Just open the file and hit rebuild to see it go
or use my rebuild macro.

Here is an AVI if you want to kick back and see
it work without having to do anything...
http://www.mikejwilson.com/misc/pendulum_animation.zip

What can we do with these crazy operators?

Mike Wilson

 

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...

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 ?

 

Me stupid C++ programmer... I didn't even knew "IIF" existed! )
Of course
D3@Sketch1"=IIF("D1@Sketch1">"D2@Sketch1","D1@Sketch1","D2@Sketch1") is much
simpler...

 

Is there a character limit to the length of an equation? I know MDT has a
limit and the only work around was to rename the variables (dimensions) to
shorter names which increased the power of the equation, but decreased the
debugging, since one has to know what 2 or 3 letter names ment .

Keith

 

Is there a character limit to the length of an equation? I know MDT has a
limit and the only work around was to rename the variables (dimensions) to
shorter names which increased the power of the equation, but decreased the
debugging, since one has to know what 2 or 3 letter names ment .

Keith

 

Is there a character limit to the length of an equation? I know MDT has a
limit and the only work around was to rename the variables (dimensions) to
shorter names which increased the power of the equation, but decreased the
debugging, since one has to know what 2 or 3 letter names ment .

Keith