why my plot is not correct?
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here is my code
x = -5:0.1:5
y = x.^(1/3)
plot(x,y)
2 comentarios
Respuestas (2)
Paul
el 11 de Abr. de 2021
If you're looking for a plot with odd symmetry, try:
plot(x,nthroot(x,3)) % check doc nthroot for details
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DGM
el 11 de Abr. de 2021
I'm not sure what you intend the correct number to be. You're doing the cube root of negative numbers. They're going to be complex.
By default, plot() will only plot the real component of complex inputs. If you're expecting the plot to be symmetrical, consider plotting abs(y) to get the magnitude of the complex-valued region.
x = -5:0.1:5;
y = x.^(1/3);
h1=plot(x,real(y)); hold on
h2=plot(x,imag(y));
h3=plot(x,abs(y));
legend([h1,h2,h3],'real','imaginary','magnitude','location','southeast')
2 comentarios
DGM
el 11 de Abr. de 2021
You probably want Paul's answer below. nthroot() calculates the real root, whereas power() or .^ calculates the complex root. The web docs include such an example.
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