(42S) {2-3}power-law to tensile-test Data-Fitting

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An extract from U.S.C.G. 1995 (OPRG) Publications Part I, U.S.DoT (NTSC), Report No. CG-D-22,97-I (DOT-VNTSC-CG-97-1.1), AUG 1997 (259 pgs.)

"A2.5 Calculator program (HP-42S) for fitting (2 or 3)-parameter power-law relations to tensile test data including slope at initial yield and nominal or true Bridgman-corrected fracture strength
The program is based on inverse Lukaciewicz (Polish) notation in which numbers are entered into a stack with the most recent on the bottom. Unary operators, such as e^x, act on the bottom number in the stack and return the result there. Binary operators, such as y^x or + , act on the lower two numbers of the stack and return the result to the bottom of the stack. The remaining numbers are dropped one position to fill the empty space. This procedure has many analogies to pre-algebraic human thinking. It can be converted to a programmable calculator that uses algebraic notation, with parentheses, by going back to the equations being evaluated.
This program uses a subroutine for solving that allow the user to specify by a second estimated input the variable to be solved for, so the same function, here called TI, can be used for several different objectives. [page 116]
Storage register & flag assignments [page 117]
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Procedures for using program [page 117]
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Calculator program with comments [page 118]
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