Software for analyzing and plotting scientific data

Abstract

Our PLT program, in use in a number of laboratories, translates a high‐level data plotting command language into Tektronix or HP‐compatible output. It is specifically designed for scientific applications, allowing maximum flexibility in the use of partial log axes, labels, and error bars, with rapid output on a graphics terminal or publication quality hardcopy on a pen plotter or laser printer. GREG, a spreadsheet data analysis program developed in parallel with PLT, allows data to be represented in terms of a five‐dimensional factorial design. It provides convenient data entry from either keyboard or digitizer pad, automatic handling of missing values, data transformations, low‐level statistical analyses, and flexible generation of tables and plots. Plots are generated by producing PLT input files. GREG can call user supplied programs to fit specific models or perform other functions, so the data analysis framework can be easily expanded. Both PLT and GREG run under RT‐11, TSX, UNIX, and MS‐DOS; they wil...