Re: Where I find Bessel function for Ada ?

[Colin Paul Gloster <Colin_Paul_Gloster@ACM.org>]

On Sat, 6 Dec 2008, Nasser Abbasi wrote:

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|"[..]                                                                        |
|> On 2008-11-26 06:57:09 -0600, "Dmitry A. Kazakov"                          |
|> <mailbox@dmitry-kazakov.de> said:                                          |
|>                                                                            |
|>> Well, if there is no Ada code, then I would also consider to implement it |
|>> from scrap. There is an excellent book "Mathematical Functions and Their  |
|>> Approximations" by Yudell L. Luke:                                        |
|>>                                                                           |
|....                                                                         |
|[..]                                                                         |
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|That is the problem with using Ada for scientific software.                  |
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|The language is great for scientific software implementation, but it comes   |
|with limited number of related functions ready to use.                       |
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|It is not practical for someone to implement these functions from scratch    |
|each time they want to use one in their scientific application. It takes a   |
|long time to develop robust mathematical functions.                          |
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|Is it not possible to link to some C library which has the implementation of |
|this function? I am sure there is some C code out there which does this.     |
|Write a binding to it?"                                                      |
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It is possible to link Ada code to code written in another
language. However widely used C and FORTRAN code from for example
"Numerical Recipes" is not robust, so to write robust scientific
software one would need to find a robust implementation. If a robust
implementation has not already been found, then writing it yourself is
not so much a drawback of Ada because you would need to do it anyway
no matter what language you would be using.

When using C or FORTRAN, which libraries have you found to be robust?
(I do not need to ask you which libraries have you used for
Mathematica; Maple; nor MATLAB. ;) )