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This is the fourth part of the GeoGebra 4.0 Sneak Peek Series
The long wait is over! GeoGebra 4.0 can now graph inequalities as shown in Figure 1.
Figure 1 – Graphs of Inequalities in GeoGebra
You can construct the graph above by typing the following in the Input bar pressing the ENTER key after each inequality. » Read more
One of the best features added to GeoGebra 4.0 (still in Beta) is graphing inequalities. The image below were sample inequalities graph plotted in version 3.9.73.0, which, as of this writing, can be downloaded here. So far, the latest GeoGebra Beta can only graph linear inequalities. The feature is till very unstable, so updates may cause for it not to work properly. Michael Borcherds, lead developer of GeGebra, told me that they are not yet sure if polynomial inequalities will be included in the 4.0 version.
Linear inequalities in GeoGebra 4.0 Beta
GeoGebra 4.0will probably be released late this year or early next year.
Thank You GeoGebra Team.
Update (Oct 2, 2010): The GeoGebra 4.0 version can now graph linear inequalities. Click here to read about it.
I wrote this because there are a lot of searches in my Blog Stat searching how to graph inequalities in GeoGebra. UNFORTUNATELY, GeoGebra is still working on this feature. I emailed Markus Hohenwarter, the creator and lead programmer of GeoGebra, two years ago requesting for this feature but he told me that he was still working on more important features.
There are, however, GeoGebra users who found a way to improvise. Some of the links are shown below.
http://www.geogebra.org/en/upload/files/english/Daniel_A_Kaufmann/Inequalities.htm
http://www.geogebra.org/en/upload/files/english/dtravis/sys_of_line_inequalities.html
http://www.geogebra.org/en/upload/files/italian/remigio/diseq/diseq.html
If you are just looking for a software that can graph inequalities, you can try Graph Calculator 3D which has a free edition. The screen shot of graphs of systems of inequalities is shown below.
Notice, that graphing inequalities in this software is very easy. First, you just have to type the equations or inequalities (upper left of the diagram), then choose the graph attributes (middle left of the diagram). You can also choose 3-dimensional graphs.
I will have a separate tutorial post on how to use the Graph Calculator 3D soon.