Double-precision square root for the CDC-3600

ABSTRACT

In January of 1960, the late Hans J. Maehly completed a summary of approximations to the elementary functions for the CDC-1604 computer. The approximations and techniques suggested by Maehly are equally applicable to the second large computer in the CDC line, the 3600. Unlike the 1604, however, the 3600 has built-in double-precision floating-point arithmetic. The present work, largely inspired by the successes of Maehly and his associates, concerns the extension of one of Maehly's ideas to a double-precision subroutine for the 3600.

REFERENCES

• 1: KOGBETLIANTZ, E. G. Generation of elementary functions. In Mathematical Methods for Digital Computers, Ralston & Will, Eds., Wiley, New York, 1962.
• 2: GOLOMB, M. Lectures on theory of approximation. Argonne Nat. Lab., 1962.
• 3: ACHIESER. Theory of Approximations. Ungar, New York, 1956.