HP 15c - 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