Drawing a function graph?

for

Answer 1

[madhan ravi]

see fplot()(link)

Use syms x and use fplot() to plot the function

[Gaston Gakomo]

Hi, im getting error when i write the function.

what is the correct way for matlab to understand it ?

[madhan ravi]

Read the link in the answer I posted and upload the code that you are trying

[Gaston Gakomo]

like this ?

>> syms f(x)
>> f(x)= x^3-x^2+2*x-4;
>> fplot(f)

[madhan ravi]

perfect!

[Gaston Gakomo]

Using the graph, i need to find the solutions for the equation in three decimal places.

but im only getting one line?

[madhan ravi]

syms f(x) y
f(x)= x^3-x^2+2*x-4;
fplot(f)
hold on
fplot(subs(y,0))
sol=vpasolve(f) %you can see two imaginary roots
solutions = roots(sym2poly(f))

[Gaston Gakomo]

thank you very much.

[madhan ravi]

Anytime :)