HP 15c Collector's Edition

236 Appendix D: A Detailed Look at _
Now use the same initial estimates to find the next root.
Keystrokes Display
| ¥
4.0000 -06
Run mode.
10 ” v
-10.0000
Same initial estimates.
20 ”
-20
´ _ 2
0.4000
Second root.
O 1
0.4000
Stores root for deflation.
) )
0.0000
Deflated function value.
Now modify your subroutine to eliminate the second root.
Keystrokes Display
| ¥
000-
Program mode.
| ‚ | ‚
030- 10
Line before n.
®
031- 34
Brings x into X-register.
l 1
032- 45 1
-
033- 30
Deflation for second root.
÷
034- 10
Again, use the same initial estimates to find the next root.
Keystrokes Display
| ¥
0.0000
Run mode.
10 ” v
-10.0000
Same initial estimates.
20 ”
-20
´ _ 2
8.4999
Third root.
O 2
8.4999
Stores root for deflation.
) )
-1.0929 -07
Deflated function value
near zero.
Now change your subroutine to eliminate the third root.
Keystrokes Display
| ¥
000-
Program mode.
| ‚ | ‚
034- 10
Line before n.
®
035- 34
Brings x into X-register.