Is the documentation available for the Matlab bessel function documentation circa 2004

2018 8 2
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Hello, I am attempting to run an old script from circa 2003-2004, perhaps written in Matlab 6.5. It calls a bessel function, but not besseli, besselj, etc. I would like to find out which bessel function it was intending to run.I would like to run the function in the current Matlab. Are the old help menus available? Thanks for your help. -Chris

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Adam Danz
Adam Danz 2018-8-2
编辑：Adam Danz 2018-8-2
I searched in the 2006a documentation and didn't find a function named bessel()
https://www.mathworks.com/help/releases/R2006a/techdoc/ref/func_b17.html?s_tid=srchtitle
Feel free to search old documentation here.
https://www.mathworks.com/help/doc-archives.html
Could it be a custom function?
Thank you for that search & link. I checked the documentation of older versions and I didn't see "bessel" either, just besselj, besseli, etc. Maybe it is a custom written function, although, if so, I thought it would have been included in the files I was given. Thanks for looking. -Chris
Walter Roberson
Walter Roberson 2018-8-2
The link I posted shows an official Mathworks bessel() function that just called besselj() . Complete source code is at that link.
Thanks Walter! That probably solves my problem. However, I didn't see the link, either I am not looking in the right place (I am new to this message board), or you forgot to post that part.

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Walter Roberson
Walter Roberson 2018-8-2

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Yes, the documentation for R6.5SP2 is available at https://www.mathworks.com/help/releases/R13sp2/helpdesk.html
However, in that release, there is no bessel() function, as opposed to besseli() and so on.
You need to look back even further, to MATLAB 4.x . In particular, you need to look at http://ftp.task.gda.pl/site/mathworks-toolbox/matlab/specfun/ where you will find MATLAB and FORTRAN source code for the bessel functions for MATLAB in that time frame. You will be able to see that back then bessel() took two parameters and called besselj() with them.

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