what is wrong?

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IOANNA B
IOANNA B 2020-10-21
编辑： Chenguang Yan 2020-10-21
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.

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回答（3 个）

KSSV
KSSV 2020-10-21
编辑：KSSV 2020-10-21
x=-3:0.1:3
y=sin(x).*cos(2*x)+1 ; % element by element multilication
plot(x,y)
Stephan
Stephan 2020-10-21
编辑：Stephan 2020-10-21
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)
Chenguang Yan
Chenguang Yan 2020-10-21
编辑：Chenguang Yan 2020-10-21
  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])

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