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IBM Computation of Sums of Products for Positive and Negative Numbers

Published online by Cambridge University Press:  01 January 2025

Paul J. Burke
Paul J. Burke*
Affiliation:
World Book Company
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Abstract

The wiring of the plugboard of the IBM type 405 machine for the computation of sums of squares and cross products of positive and negative numbers is described. The method makes greater demands on the X distributor and class selector capacity of the machine than does the method of wiring the plugboard when the numbers all have the same sign.

Type
Original Paper
Information
Psychometrika , Volume 17 , Issue 2 , June 1952 , pp. 231 - 238
Copyright
Copyright © 1952 The Psychometric Society

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Footnotes

*

Essentially the same wiring, except for the use of two-position X distributors, is briefly described by H. R. J. Grosch in “Harmonic Analysis by the Use of Progressive Digiting,” Proceedings of the Educational Research Forum, 1946, p. 82