HP 15C Bedienungsanleitung Seite 231

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Seitenansicht 230
Appendix D: A Detailed Look at _ 231
If Error 8 is displayed as a result of a search that
        
function, the estimates in the X- and Y-registers
will be relatively close together or extremely
small. Execute _ again using for initial
estimates the numbers from the X- and Y-
registers (or perhaps two numbers somewhat
further apart). If the magnitude of the function is
neither a minimum nor constant, the algorithm
will eventually expand its search and find a
more significant result.
Example: Investigate the behavior of the function
x
ex
x
eexf
2
23)(
10/
as evaluated in the following subroutine.
Keystrokes
Display
000
Program mode.
´ b .0
00142,21,.0
| a
002 43 16
003 16
x
e
.
'
004 12
®
005 34
Bring x-value into X-register.
| x
006 43 11
x
ex
2
.
*
007 20
'
008 12
2
009 2
*
010 20
x
ex
e
2
2
.
011 16
®
012 34
Bring x-value into X-register.
| a
013 43 16
014 16
1
015 1
0
016 0
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