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Ángel Martin · (This post was last modified: 07-18-2017 05:03 AM by Ángel Martin.)

(07-17-2017 06:19 PM)Gene Wrote: What values are in Z and T the first time this is executed?

If formula is in ALPHA and guesses in X and Y, then I don't see anything that pushes X and Y into Z/T the first time through the loop. Doesn't that mean you could have an error based on bad data in Z/T ?

EVALZ puts the result in Z, and EVALT puts the result in T. All is intended, no random values but f(xn-1) and f(xn),

(07-17-2017 06:19 PM)Gene Wrote: Seems like it needs a DUP2 command of some sort to DUP XY into ZT ? That might prove useful for more than just this instance.

No need for it as per above.

(07-17-2017 06:19 PM)Gene Wrote: And sorry :-) What does VIEW X(3) mean/do ? VIEW X is clear, but what is the (3) in there do ?

Yes, the "X" register is the same as the X(3) register. The number refers to its absolute address. This notation is helpful for additional clarity, like for instance to differentiate M(5), N(6) from the CPU M, N registers, etc.