>I'm using equation to draw datum curve. However, the following doesn't

>work for me,

> x=0

> y=abs(.05*sin(360*t))

> z=(1/cos(60)/tan(30)-4*.2*sin(60))*t

>It's because of the abs() I use. I really need to use this equation and >abs() is mentioned in the user guide. Anyone has any idea why this is >not working?

restrictions. If I change the parameter by SETUP#PARAMETERS#MODIFY, the

normal REGENERATE doesn't work. I have to do INFO#REGENT

INFO#BEGINNING#QUIT to update the curve.

Perhaps you can have your abs() connected to a parameter in relations

and the parameter in the curve equation.