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From: rrd@hpfinote.HP.COM (Ray Depew x2419)
Newsgroups: comp.sys.handhelds
Subject: Re: Unit Problems Solved! (Was:Re: Units Problems...
Message-ID: <19080014@hpfinote.HP.COM>
Date: 28 Sep 90 17:29:40 GMT
References: <9700@ccncsu.ColoState.EDU>
Organization: Hewlett Packard CICD
Lines: 31

Recognizing that the temperature mathematics as incorporated in the HP48SX
UNITS application still left something to be desired, HP included a couple
of fixes in the HP Equation Library card.  In the UTILS menu you will
find two functions, labeled TDELTA and TINC.

TDELTA returns the difference (delta-T) between two temperatures.  The units
of the Level 2 argument are preserved in the result.  Examples:

	20_oC  20_oC  ---->  0_oC

	120_oC  90_oF  --->  87.78_oC

	70_oF   30_K  --->  475.67_oF

TINC adds the temperature increment (Tinc) in Level 1 to the temperature in
Level 1.  The units of the Level 2 argument are preserved in the result.  
Examples:

	20_oC   20_oC  --->  40_oC

	70_oF   10_oC  --->  88_oF

	273_K  90_oC  --->  383_K

Think of TDELT and TINC as "the other subtraction and addition functions."


Regards
Ray Depew
HP Colorado IC Division 
rrd@hpfitst1.hp.com