CanadaAotS Posted November 2, 2005 Share Posted November 2, 2005 hey all! I currently use GraphCalc v4.0.1 It supports 3D graphing, and is a pretty interesting program, however I was wondering if there are any graphing programs that support relational graphs? I find having to create graphs as functions only a bit restrictive. an example is z^2 = x^2 + y^2 (a sphere) I can't make one with my current graphing calc because it doesnt do non-function graphing. If anyone knows of a graphing calculator that can do what I'm proposing, please post a link. BTW - It'd have to be a free one too lol Thanks in Advance! Link to comment Share on other sites More sharing options...
jcarlson Posted November 2, 2005 Share Posted November 2, 2005 hey all! I currently use GraphCalc v4.0.1 It supports 3D graphing' date=' and is a pretty interesting program, however I was wondering if there are any graphing programs that support relational graphs? I find having to create graphs as functions only a bit restrictive. an example is z^2 = x^2 + y^2 (a sphere) I can't make one with my current graphing calc because it doesnt do non-function graphing. If anyone knows of a graphing calculator that can do what I'm proposing, please post a link. BTW - It'd have to be a free one too lol Thanks in Advance![/quote'] Well, usually in these situations you can solve for a value in order to get a function... in the example you gave, for instance: [math]z^2 = x^2 + y^2[/math] [math]z = \pm \sqrt{x^2 + y^2}[/math] You then split this into two functions to get the complete graph: [math]z_{1}(x,y) = + \sqrt{x^2 + y^2}[/math] [math]z_{2}(x,y) = - \sqrt{x^2 + y^2}[/math] The Texas instrument line of graphing calculators is one of the best in my opinion. The Ti-89s are pretty good. Link to comment Share on other sites More sharing options...
CanadaAotS Posted November 2, 2005 Author Share Posted November 2, 2005 When I do that I get a wierd looking oval shape on my graphcalc. And btw I'm talking about 3d graphing calculators for PC. Looks like this: with the equations at the top right corner. As you can see, its not close to a sphere lol, more like to huge sails billowing out from the origin in opposite directions. And what if I wanted to make 3D equations that you can't isolate z, x, or y? There some of the more interesting looking ones too lol... (side note - why won't my graph show with the IMG tags? ) Link to comment Share on other sites More sharing options...
ydoaPs Posted November 5, 2005 Share Posted November 5, 2005 The Texas instrument line of graphing calculators is one of the best in my opinion. The Ti-89s are pretty good. i'm the only one in my school that has a 89 titanium. they found out that it can do derivatives and integral and such and now they all want one. it kinda screwed me over though. i had a test and one section was about the kepler's laws. i couldn't find the third root key. two seconds after i turned in the test i almost hit myself because i was too stupid to just raise it to the 1/3 power.... Link to comment Share on other sites More sharing options...
BobbyJoeCool Posted November 5, 2005 Share Posted November 5, 2005 i'm the only one in my school that has a 89 titanium. they found out that it can do derivatives and integral and such and now they all want one. it kinda screwed me over though. i had a test and one section was about the kepler's laws. i couldn't find the third root key. two seconds after i turned in the test i almost hit myself because i was too stupid to just raise it to the 1/3 power.... Yea, I too was the only one with a TI-89... and I loved that it did Limits and Derivatives and Intrigals... but it didn't have a nth root key... and it actually took me a couple days to figure out to raise to the 1/n power for then nth root... Link to comment Share on other sites More sharing options...
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