plotting simple one variable functions for beginner using fplot

How to create a plot for a function of one variable f(x)=x^3? If I define x1 as a symbolic real variable, and define f=x1^3, why do I get the following error when plotting f(x) for values of x between -1 and 1?

Code:

>>syms x1 real

>>f=x1^3

f =

x1^3

>> fplot(f,[-1,1]) Error using fcnchk (line 106) If FUN is a MATLAB object, it must have an feval method.

Error in fplot (line 60) fun = fcnchk(fun);

Answer 1

[Jonathan Campelli]

Hello bluseky,

Try "ezplot" instead:

syms x1 real
f=x1^3
ezplot(f,[-1,1])

If you require the use of "fplot", give me a shout, and I'll cook something else up,

Jonathan Campelli