1 Topic by James (edited by James 2013-10-31 22:28:44)

Topic: Parametic Curve Won't Evaluate

A quick bug report:

I've got a curve that Graph will plot properly, but it won't let you evaluate it over its whole domain. Also, if you set graph to calculate with complex numbers it doesn't even plot the whole function anymore.

I've attached an example file. Try evaluating the function at x>1.

The function has the same problem if entered as a normal function or a parametric function.

Post's attachments

Attachment icon Cubic.grf 680 b, 504 downloads since 2013-10-31 

Re: Parametic Curve Won't Evaluate

As you can see you get a complex result when you evaluate the function. If you want a real result you need to change Complex form to Real in the Edit|Options dialog. In most cases you will get the same result when you calculate using real and complex numbers, but x^(1/3) is one of the few cases where there is a difference.

3 Reply by James (edited by James 2013-11-12 21:31:38)

Re: Parametic Curve Won't Evaluate

Aaah yes, of course.

This solves the problem for the standard function, but the parametric function still can not be evaluated. Do you know why this is?

Re: Parametic Curve Won't Evaluate

It is a bug or at least an inconsistency in how parametric functions are evaluated. I have fixed it now in the latest beta version so they work similar to standard functions:
http://padowan.dk/graph/DownloadBeta.php