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HP HP-21 - Logarithmic and Exponential Functions; Logarithms

HP HP-21
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+(x)
N
e
e
@
Speed
and
Heading
L
225°
Vector
//
Wind
Vector
25/,
True
Vector
/
Press
Display
225
125
=
-88.39
Instrument
x-coordinate.
180
25
g
Wind
x-coordinate.
=
Wind
y-coordinate
(the
wind
is
blowing
from
due
north).
-88.39
Sum
of
y-coordinates.
ol
-113.39
Sum
of
x-coordinates.
B
143.77
Speed
of
aircraft.
Angle
of
aircraft.
360[+]
217.94
Angle
changed
to
positive
value
to
agree
with
navi-
gational
convention.
Sweeney
is
actually
flying
at
143.77
knots
on
a
course of
217.94°
Logarithmic
and
Exponential
Functions
Logarithms
The
HP-21
computes
both
natural
and
common
logarithms
as
well
as
their
inverse
functions
(antilogarithms):
3
is
log,
(natural
log);
takes
log
of
value
in
X-register
to
base
e
(2.718
. .
.).
is
antilog,
(natural
antilog);
raises
e
(2.718
. .
.)
to
the
power
of
value
in
X-register.
(To
display
the
value
of
e,
press
1[EE}).

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