How to evaluate my integral
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I tried to evaluate this integral:
∫exp(7.313 x)/√(x^2+1.7439)dx on the interval 0 to 0.001.
Then I had this kind of error : Unexpected MATLAB expression. So how do I write and evaluate it?
Thank you.
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채택된 답변
Star Strider
2014년 4월 10일
I suggest:
f = @(x) exp(7.313.*x)./sqrt(x.^2+1.7439);
fi = integral(f, 0, 0.001)
produces:
fi =
760.0254e-006
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추가 답변 (1개)
Matt Tearle
2014년 4월 10일
Hard to say what's causing the error without seeing the actual MATLAB code you used. But regardless, if you just want the numerical value, you can do that using integral (or similar functions):
f = @(x) exp(7.313*x)./sqrt(x.^2+1.7439);
integral(f,0,0.001)
The first line creates a function handle that defines the function of a single variable (x). Note the use of vector operations (such as ./) because integral will evaluate the integrand at a bunch of points simultaneously.
The second line uses integral to do the quadrature.
(You can also do symbolic integration with Symbolic Toolbox.)
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