How to plot a trinomial graph

Im having trouble plotting a trinomial graph, for the function y = x^3. I wrote out the function and tried the plot command but it wont work really.

Answer 1

[Are Mjaavatten]

fun = @(x) x^3;
fplot(fun,[-3,3])

Alternatively:

x = linspace(-3,3);
plot(x,x.^3);  % Note the use of .^, for element by element operation as opposed to matrix operation

Please type

doc fplot
doc linspace
doc plot

for more details.