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

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?

Answer 1

[Walter Roberson]

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))

[Flávio]

Thank you man! It was the matlabFunction that I needed!

[Walter Roberson]

Accept this Answer ?

Answer 2

[Jing]

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]

Thank you;)