(HP-67) Real Determinants

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An extract from Programmable Calculator Evaluation of Real Determinants, Interface Age, May 1980 (pgs 104-107), M. Patt & L. Fisher {University of Lowell}

" … pocket calculator program … presented for use with the Hewlett-Packard Model 67 (Reverse-Polish) … self-contained and complete, fits on a single magnetic card … enable an operator to quickly evaluate real determinants of sizes two-by-two through six-by-six … most accurate when all determinant elements are integers. Errors are generally less than 0.001 % for a six-by-six (worst case) determinant with all integer elements.
SOLUTION BY PIVOTAL CONDENSATION
The program written for the HP-67 calculator evaluates the determinant of a square matrix by repeated applications of the process of pivotal condensation. This procedure allows for successive reduction in determinant size, finally leaving a two-by-two determinant to be evaluated. "

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