Plotting equation of two variables

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Yuval 2017-1-23

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评论： Yuval 2017-1-23

Hi, I'd appreciate some guidance/assistance plotting: y = -sin^3(theta); x = cos^3(theta) All my attempts have produced graphs slightly different than the desired result (see attachment for my graph of reference=desired result). Could it be that the desired result (my graph of reference) was created trying to plot the equation (its solutions rather) y^2/3 + x^2/3 == 1? Mathematically it appears to be similar yet could it have produced a result somewhat different?

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回答（1 个）

KSSV 2017-1-23

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theta = linspace(0,2*pi) ;
y = -sin(theta).^3; 
x = cos(theta).^3 ;
plot(x,y)

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KSSV 2017-1-23

I don't think the result is different......to get the plot shown in the image, you need to restrict the values of theta. Use axis([0 1 -1 1]) after plotting using the above code.

Yuval 2017-1-23

I have tried that and the curve seems different. Whereas the plot shown in the image converges to zero at (2alpha*z)=~0.7, the plot your code produces only converges to zero at (2alpha*z)=~1. You see, the slope of the curve seems to be different. How may I fix this?

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