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Typical debugging tools are insufficiently powerful to find the most difficult types of program misbehaviors. We have implemented a prototype of a new debugging system, IGOR, which provides a great deal more useful information and offers new abilities that are quite promising. The system runs fast enough to be quite useful while providing many features that(More)
I have recently written a portable compiler [1] for the Fortran 77 language [2]. It attacks an old language with new tools: the parser is generated automatically from an LALR(1) grammar, the program is produced by code generators designed for another language. These tools proved very valuable, but they are based on theory and experience one or two decades(More)
This paper presents a language-independent proposal for environment parameters and basic functions for floating-point computation, and suggests a specific representation in terms of generic functions for Fortran 77. The environment parameters were originally introduced in 1967 by Forsythe and Moler [1], who attributed the essentials of their theory to(More)
an exponential rate—literally. According to one study, the Internet economy grew at a rate of 174.5 percent annually from 1995 to 1998. 1 This growth follows the equation Internet economy ∝ e year almost exactly (remember, the natural log, e, = 2.718...). A number of analysts forecast that the Internet economy will exceed US recently predicted that the(More)