Plot symbolic polynomial
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How to plot a symbolic expression that contains a symbol and i(imaginary).
Eg. Plot y=x^2+i+2
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Accepted Answer
Andrew Newell
on 11 May 2011
This plots the real part of y against x:
syms x y
ezplot(y-x^2-1i-2)
Of course, it looks just the same as
syms x y
ezplot(y-x^2-2)
EDIT: For a 3D plot, you could do this:
syms x
ezplot3(x,x^2+2,1)
xlabel('x')
ylabel('Real(y)')
zlabel('Imag(y)')
More Answers (2)
Susan
on 25 May 2011
I got an error with ezplot, so did this instead:
syms x y
y=x^(2+i)+2;
xx=linspace(-6,6,100);
yy=subs(y,x,xx);
plot3(xx,real(yy),imag(yy));grid
xlabel('x');ylabel('y');zlabel('z');
1 Comment
Andrew Newell
on 26 May 2011
That should be
y=x^2+i+2;
Even better is
y=x^2+1i+2;
because then you don't have to worry about i being used as a variable.
What error did you get?
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