# How do I plot a function that consists of a variable depending on x?

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Flávio on 5 Jan 2013
For example, after some calculations to solve my problem, I get y=x^3.
How do I plot that function? I tried to do fplot(@(x) y, limits) but it doesn't work...any solution?

Walter Roberson on 5 Jan 2013
ezplot('x^3', limits)
OR
ezplot(@(x) x.^3, limits)
OR
x = linspace(LowerLimit, UpperLimit, NumberofPoints);
plot(x, x.^3)
Or more generally if you have a symbolic variable y that contains the expression,
f = matlabFunction(y, 'x');
and then
ezplot(f, limits)
or
x = linspace(LowerLimit, UpperLimit, NumberofPoints);
plot(x, f(x))
##### 2 CommentsShow NoneHide None
Flávio on 5 Jan 2013
Thank you man! It was the matlabFunction that I needed!
Walter Roberson on 5 Jan 2013
Accept this Answer ?

Jing on 5 Jan 2013
Edited: Jing on 5 Jan 2013
Hi, It should be like this:
y=@(x) x^3; fplot(y,[-10,10]);
or
fplot(@(x) x^3,[-10,10])
You need to define the function handle.
Flávio on 5 Jan 2013
Thank you;)