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OS X (Apple)

Simple symmetrical wave RMS DEMO using awk.

 
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Operating Systems OS X (Apple) Simple symmetrical wave RMS DEMO using awk.
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Old 09-06-2017
Your sample rate is way too low. It's just like trying to mathematically approximate the volume of a teapot by calculating the volume of a cube. Far too approximate to be useful!

When I plot your sine wave data, it looks awfully triangular. The crucial area going through the origin, accounting for the vast majority of the waveform, is a straight line from 38 to 217 -- and being symmetrical, can't be anything but a straight line. There's not enough points to represent anything else.

Mathematically speaking, triangle waves and square waves include higher frequencies than their base frequencies. Without a high enough sample rate to catch them, this information is thrown out like a brutal low pass filter. (Or worse, included as aliasing artifacts.)

Your waveforms should not be 8 points per wave. 16 at bare minimum, probably, but why not 1024? Then you'd see reliable differences, all the time.
Last edited by Corona688; 09-06-2017 at 07:42 PM..
 
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LEARN ABOUT DEBIAN

sfind

sfind(1)							    ShapeTools								  sfind(1)

NAME

       sfind - shapeTools RMS recursively descend a system hierarchy

SYNOPSIS

       sfind [-subs | -comp] directory [command]

DESCRIPTION

       Sfind  recursively descends the system hierarchy of a software system managed by the shapeTools Release Management System (shapeTools RMS).
       Sfind starts it's search from directory downwards. According to the shapeTools RMS conventions, directory must contain  a  Shapefile  which
       lists the subsystems in the variable SUBSYSTEMS and the subsystem components in the variable COMPONENTS. Each subsystem is visited.

       If  no  command is specified, sfind echoes the pathnames of the subsystems it finds, or, if the option -comp is given, the pathnames of the
       components of each subsystem.

       When a command is given, it is executed in the directory of each subsystem.  The string ``{}'' in command is replaced by  the  pathname	of
       the subsystem or component.

OPTIONS

       -subs  command is invoked for each subsystem.  This is the default.  ``{}'' in command is replaced by the pathname of the subsystem.

       -comp  command is invoked for each component.  ``{}'' in command is replaced by the pathname of the component.

EXAMPLES

       List all system components:

	      sfind -comp ~/development

       Show the pathnames of all versionfiles:

	      sfind ~/development echo -n {}/ ; shape -echo VERSIONFILE

       Echo identification of the last release of each subsystem:

	      sfind ~/development vl -last -format 
		  '$__lastrelease$\n'	   
		  `shape -echo VERSIONFILE`

       Necessary quoting to echo a pair of curly braces:

	      sfind ~/development echo two \{\} braces

SEE ALSO

       find(1), sh(1), shape(1), shape_RMS(1), shape_tmpl(7)

CAVEATS

       Quoting of shell meta characters can be tough.

BUGS

       The program is slow because shape(1) is called at least once for each subsystem.

       When sfind is interrupted, usually shape(1) displays the message ``shape - interrupted'', which may be confusing.

AUTHOR

       Andreas.Lampen@cs.tu-berlin.de

shape_RMS-1.15						     Fri Jun 25 17:01:50 1993							  sfind(1)