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Computer program for plotting and fairing wind-tunnel dataA detailed description of the Langley computer program PLOTWD which plots and fairs experimental wind-tunnel data is presented. The program was written for use primarily on the Langley CDC computer and CALCOMP plotters. The fundamental operating features of the program are that the input data are read and written to a random-access file for use during program execution, that the data for a selected run can be sorted and edited to delete duplicate points, and that the data can be plotted and faired using tension splines, least-squares polynomial, or least-squares cubic-spline curves. The most noteworthy feature of the program is the simplicity of the user-supplied input requirements. Several subroutines are also included that can be used to draw grid lines, zero lines, axis scale values and lables, and legends. A detailed description of the program operational features and each sub-program are presented. The general application of the program is also discussed together with the input and output for two typical plot types. A listing of the program code, user-guide, and output description are presented in appendices. The program has been in use at Langley for several years and has proven to be both easy to use and versatile.
Document ID
19850022696
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Morgan, H. L., Jr. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
July 1, 1983
Subject Category
Aerodynamics
Report/Patent Number
NASA-TM-85648
NAS 1.15:85648
Accession Number
85N31009
Funding Number(s)
PROJECT: RTOP 505-31-23-06
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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