MaplePrimes - answers and comments on Question, nonlinear inequalilies

implicitplot

Mariner — Sun, 25 May 2008 10:12:06 Z

Allan,

Please see ?implicitplot and the two examples with the filledregions option. They are not limited to the region bounded by the Ox axis. You might get something closer to your needs by using the coloring and color options with the filledregions option.

Hope this helps,

J. Tarr

implicitplot

alla — Sun, 25 May 2008 11:55:56 Z

J Tara:

Maybe we're looking in different places. I'm using 9.5; maybe you're using a later version. In 9.5 the syntax is FILLED, not FILLEDREGIONS. Also, I can't find the examples in IMPLICITPLOTS you're referring to. And there's nothing under COLORIING.

Here's an example of a system of inequalities:

x^2 + y^2 >= 9

x^2 + y^2 <= 25

y >= |x|

I would like a graph that would give the area that is the solution set a distinctive color (like INEQUAL does for linear systems of inequalities).

Alla

There must be a way to do it in Maple 9.5

alla — Sun, 25 May 2008 12:44:48 Z

I can't believe that there is not an equivalent of INEQUAL for nonlinear inequalities in Maple 9.5. I also wonder why INEQUAL was written for linear inequalities only. Surely there is a workaround for the nonlinear case. Can someone out there suggest it?

Allan

Maple Apps Center

gkokovidis — Sun, 25 May 2008 18:11:47 Z

There is a Maple Applications Center package that looks like something that will work for you using version 9.5. You can find it here. You need to login and be registered in order to access this. Although it was not written for v9.5, it will work. There will be typesetting messages after every plot, but you will still be able to see every plot from the example worksheet that was provided. I downloaded the zip file, extracted it into my temp/Maple directory, modified my .ini file so that it includes this directory, and then started Maple. I opened the worksheet, and commented out the path at the top of the worksheet. Then I ran the rest of the commands. I did this with version 9.5, and I could see all of the plots. Hope this helps.

Regards,
Georgios Kokovidis

Dräger Medical

inequalities

Robert Israel — Sun, 25 May 2008 21:53:18 Z

You might look at inequalities in my Maple Advisor Database, www.math.ubc.ca/~israel/advisor.

This will work in Maple 9.5: unfortunately it doesn't work in Maple 11 or 12.

My Thanks to Georgios

alla — Mon, 26 May 2008 02:25:15 Z

My thanks to Georgios for steering me to the Maple Package. Inequalityplot works fine. I advise anyone using it to set feasiblepoints to 50 to get the area of the solution set to look exactly right.

Alla