How do I multiply two trigonometric functions

2016 2 16
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更新时间：2020 5 4
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Hi I am trying to multiply sin(x) by the cos(x) and graph the result. What am I doing now is not working. Can someone please explain to me what I am doing wrong? Here is my code.
x=[-2:0.5:10];
y=(sin(x))*(cos(x));
plot(x,y)

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John Hart
John Hart 2020-5-4
this was very helpful, thanks belleagured student .... in MSEE program

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回答（1 个）

the cyclist
the cyclist 2016-2-16

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You need element-wise multiplication
y=sin(x).*cos(x);

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Alexander Lleonart
Alexander Lleonart 2016-2-16
I put this in, x=[-2:0.5:10]; y=sin(x).*cos(x);
and I got:
warning: function ./test.m shadows a core library function
Star Strider
Star Strider 2016-2-16
1. To multiply trigonometric functions, another option is the Wikipedia article covering the List of Trigonometric Identities.
2. Don’t name any variables or files the same as built-in MATLAB functions. This is called ‘overshadowing’. Name your file something else. MATLAB is case-sensitive, so renaming it Test.m would be sufficient.
the cyclist
the cyclist 2016-2-17
Moved this from an "answer" from Alexander to a comment here:
I am sorry you were right. That does work. Thank you.
the cyclist
the cyclist 2016-2-17
The best form of thanks is to upvote and/or accept an answer. This rewards the contributor, and can point future users to helpful answers.

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