Re: Math functions in Ada

[Jacob.S.Rosenberg.1@gsfc.nasa.gov (Jacob S. Rosenberg.)]

wfrye@mnsinc.com (William Frye) wrote:


>Is a there a source of freeware Ada routines for simple math functions?
>I am particularly interested in a routine  to calculate x**y where x and y
>are floating point numbers.  I am working with gnat on a Win95 platform.

Hi William,

First of all, x**y equals exp(y * log(x)).  So, all you need are the
log (logarithm) and exp (exponential) functions.  It should be failrly
easy to write such a function as log and exp are generally provided.
Indeed, the whole thing would be:

return exp(y * log(x));

I strongly recommend that the input values and the functions used are
of type long_float and not float in order to provide greater range and
accuracy.  The function itself could return a float.  In that case,
you can do a conversion to float before the return statement.

Regards,

Jacob Rosenberg

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