Ed Casas (edc@ece.ubc.ca) Mon, 31 Jan 2000 12:50:59 -0800
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Date: Mon, 31 Jan 2000 12:50:59 -0800 From: Ed Casas <edc@ece.ubc.ca> Subject: Re: Assignment 2: problem 4.17> I have a question about this problem? How can we plot the pdf > and cdf without knowing the Io (the modified Bessel function)? You have a number of options: (1) If are creating your plot using Matlab (e.g. you have an ECE Unix account) you can use the function: besseli(0,x) If you prefer Mathcad, Mathematica or Maple, they have equivalent functions (if you don't know how to use one of these programs, now's probably a good time to learn). (2) If you are using Excel you can use the besseli() function (included in the Engineering functions). (3) Your calculator may be able to compute the modified bessel function. (4) You can find the bessel function tabulated in handbooks of mathematical functions, for example, Abramowitz and Stegun. (5) If you want to do things the hard way, you can get the C source code for the modified Bessel functions and an explanation of how the routines are written from: http://lib-www.lanl.gov/numerical/bookcpdf/c6-5.pdf or the SLATEC code in FORTRAN (which you can compile on some Unix system via f2c): http://www.netlib.org/cgi-bin/netlibfiles.pl?filename=slatec/fnlib/besi0.f -- Ed Casas edc@ece.ubc.ca http://casas.ece.ubc.ca +1 604 822-2592
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