Integration help (quad)

2 次查看（过去 30 天）
Jeffrey
Jeffrey 2011-4-8
New to Matlab and stuck trying to integrate trigXtrig function.
Here's what I've been doing:
function y=rfun(theta)
y=(cos(theta).*sin(theta).);
end
EDU>> q=quad('rfun',0,0.644)
But I get this error:
Error in ==> quad at 77
y = f(x, varargin{:});
  1 个评论
John D'Errico
John D'Errico 2011-4-8
So what error did you get???? You only wrote part of the error here, the part that gives insufficient information!

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采纳的回答

Matt Fig
Matt Fig 2011-4-8
Why not use an anonymous function instead?
>> y = @(th) cos(th).*sin(th); % The function to integrate...
>> q = quad(y,0,0.644) % Also, quadl(y,0,0.644)

更多回答（2 个）

Friedrich
Friedrich 2011-4-8
Hi Jeffrey,
I think you get this error because of the extra dot after sin(theta). You function rfun should look like this:
function y=rfun(theta)
y=(cos(theta).*sin(theta));
end
I hope I could help, Friedrich
Jeffrey
Jeffrey 2011-4-21
Thanks Friedrich and Matt.
Jeff

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