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July 23rd, 2012, 02:28 AM  #1 
Member Joined: Apr 2010 Posts: 43 Thanks: 0  circle in mathematica
Can somebody please tell me how can I draw cirlces in mathematica? Plot[y=x^2+5^2=5],{x,0,3}] does not work. 
July 23rd, 2012, 02:34 AM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: circle in mathematica
I know nothing about mathematica, but if you're trying to plot the circle centered at the origin having radius 5, perhaps: Plot[x^2+y^2=5^2],{x,5,5} I'm guessing at the specific syntax though. 
July 23rd, 2012, 05:29 AM  #3  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: circle in mathematica Quote:
Something like Code: Plot[{Sqrt[5^2  x^2], Sqrt[5^2  x^2]}, {x, 5, 5}]  
July 23rd, 2012, 05:42 AM  #4 
Member Joined: Apr 2010 Posts: 43 Thanks: 0  Re: circle in mathematica
Yes, what you have written are to equations. Is it possible to plot functions of to varibles (circles, elpises, hyperbolas) by just inserting the equation)?

July 23rd, 2012, 05:58 AM  #5 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: circle in mathematica
Zero equations, but rather a list of two expressions. I don't know if Mathematica can plot an equation directly. But you could give it just one expression in PolarPlot and it would work. 
July 26th, 2012, 04:29 AM  #6 
Math Team Joined: Nov 2010 From: Greece, Thessaloniki Posts: 1,990 Thanks: 133 Math Focus: pre pre pre pre pre pre pre pre pre pre pre pre calculus  Re: circle in mathematica [color=#000000]You can use the parametric form, for example in order to draw the circle x^2+y^2=5, Code: ParametricPlot[Sqrt[5]{Cos[t],Sin[t]},{t,0,2Pi}] Code: ContourPlot[x^2+y^2==5,{x,3,3},{y,3,3},Axes>True] 
July 26th, 2012, 06:49 AM  #7  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: circle in mathematica Quote:
 

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