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HP HP-20S - Page 94

HP HP-20S
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The
main
program
is
58
lines
long
and
uses
registers
Rs
through
Rg
and
labels
A,
F,
7,
8,
and
9.
The
remaining
program
lines,
registers,
and
labels
can
be
used
for
defining
f(x).
Program
Instructions:
1-
5.
7.
Press
(\y]
[PRGM],
then
(]
B
to
load
the
program.
Then
press
(9]
(o]
once
to
move
to
the
last
line
of
the
program.
After
the
LBL
F
on
line
58
(58-
61 41
F),
enter
the
keystrokes
to
calculate
the
value
of
f(x)
using
a
value
of
x
in
the
display.
See
the
example
below.
Press
[9]
[PRGM].
Enter
the
lower
limit
of integration
(x)
and
press
5
to
save
it
in
R5.
Enter
the
upper
limit
of
integration
(x,)
and
press
6
to
save
To
calculate
the
integral,
enter
the
number
of integration
inter-
vals
and
press
(A].
This
number
must
be
an
even,
positive
integer.
To
enter
a
new
function,
repeat
the
instructions
starting
at
step
1.
Example:
Calculate
the
integral
of
f(x)
=
x®
—
x
—
1
from
x;
=
0
to
x,
=
3
using
8
integration
intervals.
Keys:
Display:
Description:
()
(Frem)
(S)
Loads
program.
B
int
00-
(]
(a]
58- 61 41
F
Displays
label
for
be-
ginning
of
f(x)
routine.
0
59-
210
Starts
f(x)
routine;
saves
X.
60-
14
6
61- 6
=]
62-
65
x®.
92
7:
Built-in
Program
Library

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