> 1. Anyone has a calculation or source (prefereable) do do Byorritms ??

Sorry, never heard of them.

> 2. How to do a
> 
>     X , Y, Z : Real
>     ...
>    X := Y ^ Z;   <========= ^ power ?????

Power code is a fraught area. For MOST cases you can get away with

function pow(value : real; power : real) : extended;
begin
    pow := exp(ln(value)*power);
end;



----------------------------------------------------------
Phil Scadden, Institute of Geological and Nuclear Sciences
41 Bell Rd South, PO Box 30368, Lower Hutt, New Zealand
Ph +64 4 5704821, fax +64 4 5704603
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