Invalid Equation Driven Curve 1

[kellnerp]

SW2009

I created an equation driven curve as follows:

sin(x/2)

x1 = pi
x2 = -pi

delta y = -.25

This gives an invalid solution error.
I cannot create a tangency relationship to the end of the curve.
The curve sometimes plots outside the domain (which may be the root of the problem).



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[takedownca]

x2 < x1. Flip the negative signs, and it works fine.

 

[kellnerp]

Good point. Thanks.

I wonder if they fixed this in 2010?

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[takedownca]

Looks like 2010 still has the same positive delta-x limitation. I wouldn't think it would matter much to you get the same curve regardless. However, if plotting backwards makes some sort of sense to your application you can do it in 2010 via a Parametric type equation. It would look something like this.

xt = pi*t
yt = sin(pi*t)
t1 = -1
t2 = 1

 

[kellnerp]

I haven't upgraded yet. The parametric functionality sounds interesting.

This is a relatively simple user interface design issue. In math there is no restriction on summing or integrating backwards. If the direction of the line was important this should work.

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[mjcole]

Parametric is good but the equation editing is still sub-par.
Closed curves still cannot be created if they are closed loops.

For T1 T2 try using integers -1,1 for t and using (t*pi) in relations.

SolidWorks should ad UI to allow for editing equations using parameters similar to Equations dialog in 2009.

SW2010 does allow for Parametric curve by equation in 3D Sketches.

Michael

 

[kellnerp]

Thanks for the info.

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