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Modification in besselk (Modified Bessel fn of 2nd kind order zero)

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Waseem Akhtar
Waseem Akhtar 2021 年 7 月 24 日
コメント済み: Waseem Akhtar 2021 年 7 月 24 日
As far as I know, besselk in integral form is an integral from 0 to Inf. Is there a way to modify the limits of integration and convert it into a definite integral?
I have tried to evaluate the integral form by using "integral/int" functions but it takes too much time as compared to evaluation of besselk(nu,z). I hope there's a way to change the limits in the syntax of besselk.
Thank you.


John D'Errico
John D'Errico 2021 年 7 月 24 日
Simple answer - No.
Utilities like this, erf is another excellent example, that while they can be defined in terms of an integral, are not in fact implemented in terms of a numerical integration. Instead, other methods, perhaps a series approximation, are employed to compute the result. And that method will not be changable to allow other limits.
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Waseem Akhtar
Waseem Akhtar 2021 年 7 月 24 日
@John D'ErricoThank you for your reply. Is there any other way to do this?


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