15c SOLVE question on usage

[Jeff_Kearns]

(05-01-2014 03:14 AM)Thomas Klemm Wrote:  

(05-01-2014 03:06 AM)lemontea Wrote:  Why did the example have to enter the last 2 values before executing SOLVE? (the 0.5 and the 5; and then later the 0.5 and 6).

These are initial values for SOLVE.

These particular examples do not require initial guesses. The program will still work without them. Initial guesses are usually only required when seeking more than one root, such as in a quadratic equation. As far as I am concerned, Karl Schneider's MISO technique, which essentially makes the 15C and 34C (as well as the 41C/Advantage) solver work just like that of the Pioneers, is one of the most useful tricks I have come across.

I used it in adapting a TVM program for the 15C (Accurate TVM for HP-15C). It is only 40 lines long (in it's current form), uses a single label, and is an order of magnitude easier to use compared to the 108 line program in the Advanced Functions Handbook which uses 10 labels. I credit this program, in part to the Indirect addressing 'trick' discussed in this thread.

Jeff K