Method and data processor for finding a logarithm of a number

Details Method and data processor for finding a logarithm of a number Method and data processor for finding a logarithm of a number

1994-12-05

1996-10-29

Malzahn, David H.

Boots, shoes, and leggings

364722, G06F 102

Patent

active

055703100

ABSTRACT:
A data processor and method are used to find log.sub.p (x) wherein p is a numerical base and x is a floating point value. The method begins by deriving a number y from the quantity x wherein the number y has a predetermined sign portion, a predetermined exponent portion, and the fraction portion f. The predetermined fraction portion f being a truncated portion of x. A logarithm to the predetermined base p of the number y is found by calculating:

REFERENCES:
patent: 5301138 (1994-04-01), Lindsley
"An Accurate Elementary Mathematical Library for the IEEE Floating Point Standard," Gal et al; ACM Transactions on Mathematical Software, vol. 17, No. 1, Mar. 1991.
"Table-Driven Implementation of the Logarithm Function in IEEE Floating-Point Arithmetic," Tang; ACM Transactions on Mathematical Software, vol. 16, No. 4, Dec. 1990.

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