Receiving mtimes error for passing vector through a function and I don't know why. Help?

2012 2 15
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Honglei Chen
Honglei Chen 2012-2-15

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You need to use .*
y = exp(2*sin(0.4*x))*5 .* cos(4*x);

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Victor
Victor 2012-2-15
thank you! I was putting after the exp().
Why does it need to be after the 5?
Honglei Chen
Honglei Chen 2012-2-15
You can think of anything before 5 is a row vector and then everything after 5 is another row vector. To multiply two vectors together, you need the .* there. If you put it in front of 5, since at that time MATLAB is evaluating a multiplication between a vector and a scalar, it doesn't help. Once it finishes 5, it still encounter the same situation. If you have to put it in front of 5, then you need to group 5 and cos(4*x) together with a parenthesis.

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