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Software For Multivariable Frequency-Domain AnalysisFREQ (Multivariable Frequency Domain Singular Value Analysis Package) software package of subroutines performing frequency-domain analysis of: continuous- or discrete-multivariable linear systems; any continuous system for which one calculates transfer matrix at points on imaginary axis; or any discrete system for which one calculates transfer matrix at points on unit circle. Four different versions available. Single-precision brief version LAR-14119, single-precision complete version LAR-14120, double-precision brief version LAR-14121, and double-precision complete version LAR-14122. Written in ANSI standard FORTRAN 77.
Document ID
19910000455
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Armstrong, Ernest S. (NASA Langley Research Center, Hampton, VA.)
Giesy, Daniel P. (Planning Research Corp.)
Date Acquired
August 14, 2013
Publication Date
September 1, 1991
Publication Information
Publication: NASA Tech Briefs
Volume: 15
Issue: 9
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
LAR-14121
LAR-14119
LAR-14122
LAR-14120
Accession Number
91B10455
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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