# complex numbers

• Aug 3rd 2008, 10:31 PM
McCoy
complex numbers
Hi guys, how do you graph an expression involving compex numbers,say y=x-1/3ix^3 using classpad or ti 89?I have tried to draw a couple of simultaneous equations like this using ti 89 and classpad but they show nothing on the graph...they just draw an empty graph(i.e they assumed they have drawn it/them but show nothing on the graph). How can I overcome this problem? My calculators are in complex mode every time I try to graph such expressions. I'll apprecaite your help. Thanks.
• Aug 4th 2008, 03:18 AM
mr fantastic
Quote:

Originally Posted by McCoy
Hi guys, how do you graph an expression involving compex numbers,say y=x-1/3ix^3 using classpad or ti 89?I have tried to draw a couple of simultaneous equations like this using ti 89 and classpad but they show nothing on the graph...they just draw an empty graph(i.e they assumed they have drawn it/them but show nothing on the graph). How can I overcome this problem? My calculators are in complex mode every time I try to graph such expressions. I'll apprecaite your help. Thanks.

How would you draw, by hand, the graph of something much simpler like y = ix? Plainly it can't be done on a traditional xy-coordinate plane.

The technology can only draw graphs of real functions.
• Aug 7th 2008, 06:19 AM
McCoy
Quote:

Originally Posted by mr fantastic
How would you draw, by hand, the graph of something much simpler like y = ix? Plainly it can't be done on a traditional xy-coordinate plane.

The technology can only draw graphs of real functions.

Oh thanks alot.I've used the 3D graph and there I got it.Believe it or not, your comment gave me a clue on what graph I should use.So everything is solved. It's actually some weird looking graph(x,y,z axis) with y extending outward at both directions from the origin.i.e passing through the orgin nd continues it way out while z and x end at the origin(it's hard to say this and I don't know if anyone woud get this description because I don't think I'm saying it right).