plotting circumference

[carmelomat]

hi mans!.
how can i plot a circumference in matlab knowing the equation?..such as x^2+y^2+3x-2=0...

thanks

 

[GregLocock]

set up a parametric equation in i and then plot x(i) against y(i)

Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[carmelomat]

i don't understand...how can i set parametric equation?..
i can't plot with matlab in implicit form..but only
plot(x,t)...
oh god!

 

[carmelomat]

i find this :

http://www.mathworks.com/access/helpdesk/help/toolbox/mupad/plot/PRIMITIV_Implicit2d.html

but i try the example:
plot(plot::Implicit2d(x^2+y^2-1, x = -1..1, y = -1..1))

and matlab find an error..
>> plot(plot::Implicit2d(x^2+y^2-1, x = -1..1, y = -1..1))
??? plot(plot::Implicit2d(x^2+y^2-1, x = -1..1, y = -1..1))
|
Error: Unexpected MATLAB operator.

how can i resolve?
thanks

 

[IRstuff]

Is this for school?

TTFN

FAQ731-376