
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
as evaluated in the following subroutine.
Bring x-value into X-register.
Bring x-value into X-register.
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