


Functions


The Standard Function Catalog


The HP41C has over 130 internal functions that allow you to compute answers
to problems quickly and accurately. You can list this set of functions at any
time by pressing
g
CATALOG 3.


This section gives a brief explanation of most HP41C standard functions
(except programming functions, which are presented in
part II) along with
some example problems. All of the functions in this section can be stored
and executed in program memory as part of a user program unless otherwise
noted. Remember, execution of all functions not on the keyboard is simple
when you assign the functions to the USER mode keyboard for execution (refer
to section 4).


General Mathematics Functions


Changing the Sign of a Number


To key in a negative number, press the keys for the number, then press
CHS (change sign). The number, preceded by
a minus (–) sign, will appear in the display. You can also change the
sign of either a negative or positive nonzero number in the display by
pressing CHS . For example, key in 2.54 and
change the sign of the number.




To change the sign of an exponent of a number, you
must use CHS immediately after
keying in the exponent (before you perform some operation
that terminates digit entry). As soon as digit entry is
terminated, CHS changes the
sign of the mantissa of the number, not the exponent.
For example, key in the Rydberd constant (1.0973731
× 10^{7}, a universal constant used in
spectroscopy) and change the sign of the exponent.




