HP HP-65 - Functions

Section 3
Functions
You have already learned to use the arithmetic functions ([#,
1,IX! ,=) in both the stack and the addressable registers. You
have also learned to move numbers among the calculator’s regis-
ters and to enter and display data in both fixed and scientific
format. To complete the subject of manual calculation, we will
return to the non-arithmetic functions, things like sine, logarithm,
square root . . .
Keys Introduced in this Section
s oms) (7] @
o (o] [ (Foer] B0 (]
Taken as a whole, the functions are both powerful and impor-
tant. While, conceivably, you might not use them directly, you
will almost surely use them indirectly when you use prepro-
grammed cards from the Standard Pac and other pacs. For ex-
ample, you already used the exponential function ([ ¥ ]) and
the integer function([INT]), when you used the Personal Invest-
ment program presented in the Introduction. Without [7¥ ], the
program would have to use more laborious arithmetic methods,
repeatedly.
The functions are both easy to learn and easy to use. In the
Introduction you found that to do a function, you press a
prefix key(, [, or @) and follow it by the desired function
key: you use the [8] prefix to calculate a function having a blue
symbol, you use [ to calculate a function having a gold symbol,
and you use [ to calculate the inverse or complement of the
function denoted by a gold symbol.
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