Equation Discoveries II

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Mike J. Wilson 22 years ago

For those of you who missed part I, here's the original link...

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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...

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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...

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What can we do with these crazy operators?

Mike Wilson

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Philippe Guglielmetti 22 years ago

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

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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 ?

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Mike J. Wilson 22 years ago

That is nice. I'll have to experiment with that. You didn't use "IIF" Thanks for the help Philippe!

Mike

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Philippe Guglielmetti 22 years ago

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...

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Keith Streich 22 years ago

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

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Keith Streich 22 years ago

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

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Keith Streich 22 years ago

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

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Mike J. Wilson 22 years ago

I've never heard of one, although the equation editor is about the clunkiest thing you've ever used which makes it very tedious to work on long equations.

Mike Wilson

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clay 22 years ago

Mike, everyone,

I used to use the equations/editor all the time in the early days. But have virtually given up using equations, since they are such a pain to set up & debug, and is the most ignored SW utility. Perhaps we could all gang up and submit our suggestions, and get them incorporated in

2005. Here are some of mine. I am not currently using 03/04, so ignore those that are already in there.

Allow "variable" drag and drop from sketches. Click on a dimension, cut & paste or drag & drop into equation.

Highlight the sketch in the feature manager when selecting each a variable in the editor.

2a. Better yet, allow a find sketch when selecting a variable, or add a search for sketch by variable.

Highlight all dims/sketches in colors when selecting equations. (Similar to Excell)
Allow direct import or dynamic excell equations.

clay

Mike J. Wils>>"Keith Streich" wrote...

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Equation Discoveries II

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