how do i plot sin(2pi3t) sin(2pi*15t)

Question

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how do i plot sin(2pi*3t) * sin(2pi*15t)?

Ive tried and got this:

y=sin(2*pi*3*t)*sin(2*pi*15*t);

Error using *

Incorrect dimensions for matrix multiplication. Check that the number of columns in the first matrix matches the number of rows in

the second matrix. To perform elementwise multiplication, use '.*'.

>> y=sin(2*pi*3*t.)*sin(2*pi*15*t.);

y=sin(2*pi*3*t.)*sin(2*pi*15*t.);

↑

Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched

delimiters.

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Answer 1

David Goodmanson 2019-3-12

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Hi Jesus,

what they are saying is

% .* for element-by-element multiplication
y=sin(2*pi*3*t).*sin(2*pi*15*t);