what is wrong?

i want to plot the function f(x)=sin(x)*cos(2*x)+1 , xe[-3,3].

my code is:

x=-3:0.1:3
y=sin(x)*cox(2*x)+1
plot(x,y)

Can you please help me? I'm new in MatLab programming and i have no idea what's wrong. Thank you.

Answer 1

[KSSV]

x=-3:0.1:3
y=sin(x).*cos(2*x)+1 ; % element by element multilication
plot(x,y)

Answer 2

[Stephan]

Typo - it is cos instead of cox, and the usage of '.*' elementwise multiplication

x=-3:0.1:3
y=sin(x).*cos(2*x)+1
plot(x,y)

Answer 3

[Chenguang Yan]

1. Misspelling : cox -> cos
2. * (Matrix multiplication) -> .* (Multiplication)

Try this:

x = -3:0.1:3
y = sin(x).*cos(2*x)+1
plot(x,y)

Or use fplot()

syms x
y = sin(x).*cos(2*x)+1
fplot(y,[-3,3])