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Function Keys
63
Example 2:
Convert
polar
coordinates (S,
120°) to rectangular
coordinates
.
(X,y)
r=8
Press
Display
m
~
1
0.00
120mimJS
18.
y
x
Specifies
degrees mode
.
(Assumes
no results
remain
from previous
example .)
Polar
coordinates
(!
and
r
placed in
Y -
and X-registers
,
respectively.
a
~
1-4.00
x-coordinate
.
EiD
1
6.93
1
y-coordinate.
Logarithmic and Exponential Functions
Logarithms
The
H P-25
computes
both natural
and common
loga
rithms
a
s
well as
their inverse
functions
(a ntiloga
rithms)
:
a
lli!J
is
loge
(natural
log)
.
It
takes
the
log
of the
value in
the
X-register
to
base e (2.7IS ... )
.
m
~
is
antilog , . (n
atura
l
a
ntilog). It
rai se
s
e (2.7IS
...
) to
the power
of
the va
lue in
X-regi ster. (To di splay the
value of e
, press
I
m
~
.)
a
[IQ9J
is
loglo
(common
log)
.
It
compute
s
the log
of the value
in the
X-register to
ba
se
10.
m
~
is
a
ntilog lo
(common antilog). It
ra
is
es
10
to
the power
of
the
value
in
the X-register.
Example 1:
The
1906
San
Fra
nci
sco
ea
rthquake
,
with
a
magni-
tude of S.25 on the Richter Scale
is
e stimated to
be 105 times
greater than the Nicaragu
a
quake
of
1972.
What
would
be
the
magnitude
of
the latter
on
the
Richter Scale? The equation
is
M.,
105
RI
=
R2
-
log
M;=
S.25
-
(log
-1-)
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