Polar model builder in 6.01 gives invalid expression error for angular variables

Tammy Humphrey
5 Posts

I am trying to build a polar dynamic model to track an object rotating on a record player. If I include theta or omega in my expression for the force function fr I get the error message "invalid expression: unable to parse" (the variable vr works).

Re: Polar model builder in 6.01 gives invalid expression error for angular variables -

Tammy Humphrey
5 Posts

Would anyone have any ideas about how I could resolve this issue with polar models? I was hoping to get my students to model rotation for an assignment this week... ...it's pretty hard for any but the most capable to do without using polar coordinates. Would be grateful for any suggestions! Thanks.

Re: Polar model builder in 6.01 gives invalid expression error for angular variables -

Douglas Brown
339 Posts

This issue will be fixed in the next release, which should be within a week or so. Doug

> I am trying to build a polar dynamic model to track > an object rotating on a record player. If I include > theta or omega in my expression for the force function > fr I get the error message "invalid expression: unable > to parse" (the variable vr works).