How do I express a modified Bessel function of the second kind in Gnuplot? I need to fit my data with the function which is included the modified Bessel function of the second kind.
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With modified bessel functions you are kind of reaching the end of gnuplot, have a look at octave or maxima maybe? – Wolfgang Brehm May 11 '20 at 13:46
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Have you checked the manual? Try help expressions functions.
plot besj0(x), besj1(x), besy0(x), besy1(x)
or do you need higher orders?
theozh
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I have checked the manual and seen these functions. But I don't know how do I convert Bessel function into its modified forms. Can you please tell how do I convert them? – Purew Battogtokh May 06 '20 at 08:37
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1sorry, I overlooked, you wrote _modified_ Bessel. Probably, you have to implement it yourself using the expression you can find here: https://en.wikipedia.org/wiki/Bessel_function#Modified_Bessel_functions. Unfortunately, it looks like gnuplot Bessel function implementation does not take complex arguments :-(, so you will end up with infinite sums... or some sufficient approximation. – theozh May 06 '20 at 09:03