constantly receiving an error undefined function or variable z when use solve

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Maria Giulia
Maria Giulia 2020-1-4
评论： Stephen23 2020-1-4
I was trying to find the intersection points of these function
f1=sym('y=x^3');
f2=sym('x^2+y^2=1');
S=solve(f1,f2,x,y);
solx=eval(S.x);
soly=eval(S.y);
I can't do eval(S.x) because i receive the error
Undefined function or variable 'z'.

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采纳的回答

Fabio Freschi
Fabio Freschi 2020-1-4
编辑：Fabio Freschi 2020-1-4
Polynomials with a degree greater than 4 do not have explicit solutions. You can use vpa
syms x y
f1 = y == x^3
f2 = x^2+y^2==1;
S = solve([f1, f2],x,y);
vpa(S.x)
vpa(S.y)
Or double if you accept a double result
double(S.x)
double(S.y)

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