Engineering topics

Hedgley, D. R.

Publications and source records attributed to Hedgley, D. R..

3 records

NASA NTRS1981

Solution to the hidden-line problem

It is pointed out that realistic three-dimensional renderings of solid objects or surfaces by computers have long been needed. The NASA Dryden Flight Research Center will soon publish a report and the computer program on an algorithm that solves for hidden lines. The computer program is written in FORTRAN IV and its size is approximately 35N + 9500 words, where N is the number of elements. A number of pictures are presented which were drawn by a computer using the algorithm.

Hedgley, D. R.↗

NASA NTRS1979

A characterization of the real zeros of a particular transcendental function

The real zeros of the transcendental function y = ax + becx are characterized, and the results should alleviate the difficulty of determining their existence, location, and number.

Hedgley, D. R.↗

NASA NTRS1978

An efficient algorithm for choosing the degree of a polynomial to approximate discrete nonoscillatory data

An efficient algorithm for selecting the degree of a polynomial that defines a curve that best approximates a data set was presented. This algorithm was applied to both oscillatory and nonoscillatory data without loss of generality.

Hedgley, D. R.↗