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HP HP-25 - Logarithmic and Exponential Functions

HP HP-25
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Example
2:
Convert
polar
coordinates
(8,
120°)
to
rectangular
coordinates.
(x,y)
6
=120°
r=8
\
\
X
Press
Display
B8
Specifies
degrees
mode.
(Assumes
no
results
remain
from
previous
example.)
120
8
Polar
coordinates
6
and
r
placed
in
Y-
and
X-registers,
respectively.
n
-4.00
x-coordinate.
y-coordinate.
Logarithmic
and
Exponential
Functions
Logarithms
The
HP-25
computes
both
natural
and
common
logarithms
as
well
as
their
inverse
functions
(antilogarithms):
[[a]
islog,
(natural
log).
It
takes
the
log
of
the
value
in
the
X-register
to
basee
(2.718
. .
.)
.
B8
is
antilog,
(natural
antilog).
It
raises e
(2.718
. .
.) to
the
power
of
the
value
in
X-register.
(To
display
the
value
of
e,
press
1B
[e7].)
B
is
log,,
(common
log).
It
computes
the
log
of
the
value
in
the
X-register
to
base
10.
9]
is
antilog,,
(common
antilog).
It
raises 10
to
the
power
of
the
value
in
the
X-register.
Example
1:
The
1906
San
Francisco
earthquake,
with
a
magni-
tude
of
8.25
on
the
Richter
Scale
is
estimated
to
be
105
times
greater
than
the
Nicaragua
quake
of
1972.
What
would
be
the
magnitude
of
the
latter
on
the
Richter
Scale?
The
equation
is
M,
105
R,
=
R,
—
log—"*=
8.25
—
(log
——
1
Y
5
(log
0
)

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