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

### Flávio (view profile)

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?

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### Walter Roberson (view profile)

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))
```

Flávio

### Flávio (view profile)

on 5 Jan 2013

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

Walter Roberson

on 5 Jan 2013

on 5 Jan 2013
Edited by Jing

### Jing (view profile)

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

### Flávio (view profile)

on 5 Jan 2013

Thank you;)

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