Problem (Bug?) with equation curve editor? (Autodesk Inventor 2013(

[Jack_Stone]

Hello,

I am currently trying to plot the equation for a Sears-Haack body.

The equation I am using is:

fx(t) = sqrt((16*10 )/(3*pi^2))*((4*x)*(1-x))^3/4

fy(t) = t

tmin = 0

tmax = 1

This equation works perfectly on the two online function plotters that I have tried it on, however, Inventor fails when I try to add the "^(3/4)" part of the equation. The error I get is:

"Cannot evaluate x^y if x is zero and y is less than or equal to zero, or if x is zero or negative and y is not an integer"

I get this error twice.

I have tried various different ways of entering this equation, and various values for tmin and tmax, and still nothing.

Is this a bug? Or am I doing something wrong? Is there some way I can export the plots from another tool to a format inventor can read them in, and then import them to inventor?

Thanks for any advice!

[johnsonshiue · Accepted solution]

Hi! Indeed, this is a limitation with Equation Curve on Inventor 2013 and 2014. The issue has been resolved on Inventor 2015. In the meantime, you can set the slightly smaller upper bound (0.9999999) and slightly bigger lower bound (0.0000001 to get past the issue.

Thanks!

[Jack_Stone]

Aha! That is excellent, thank you! That works perfectly!