HP 15c User Manual
Page 52
52
Section 2: Working with
f
52
The program has the following characteristics:
The display format specifies the accuracy of the integrand in the same way as it does
for f
itself. However, if you specify an unnecessarily large number of display
digits, the calculation will be prolonged.
Small function values, such as Q(20), P(−20), and erfc(10), are accurately computed
as quickly as moderate values.
Keystrokes
Display
|¥
Program mode.
´CLEARM
000-
´bA
001-42,21,11
Program for P(x).
O2
002- 44 2
Stores x in R
2
.
”
003- 16
Calculates −x.
t2
004- 22 2
Branches to calculate P(x) = Q(−x).
´bB
005-42,21,12
Program for Q(x).
O2
006- 44 2
Stores x in R
2
.
´b2
007-42,21, 2
2
008- 2
¤
009- 11
÷
010- 10
GC
011- 32 13
Calculates erfc(
2
/
x
).
2
012- 2
÷
013- 10
Calculates
Q(x) = ½ erfc(
2
/
x
)
l2
014- 45 2
O0
015- 44 0
Stores x in R
0
.
)
016- 33
|n
017- 43 32
Returns function value.
´bC
018-42,21,13
Program for erfc(x).
1
019- 1
G4
020- 32 4
|?1
021-43, 6, 1
Tests flag 1 set.
t5
022- 22 5
Branches for flag 1 set.
1
023- 1
-
024- 30
Calculates erf(x) – 1 for flag 1 clear.
´b5
025-42,21, 5
”
026- 16
Calculates erfc(x).
|n
027- 43 32
Returns function value.
´bE
028-42,21,15
Program for erf(x).
0
029- 0