tipi di file nome.txt nome.plt nome.DAT

file nome.txt : listato scritto usando NOTES e salvato come programma file.txt
verrà richiamato da GnuPLot e visualizzerà le istruzioni inserite,come se fosse stato scritto
direttamente con GnuPlot attivo e possibilità di vedere effetti in fase di elaborazione

file nome.dat viene richiamato con plot "nomefile.dat"

file nome.dem trasformato in file nome.txt

testo txt

set xrange[-10:10]
plot sin(x)
pause -1
plot cos(x)
pause -1
plot tan(x)
pause -1
set xrange [0:4*pi]
plot asin(x)
pause -1
plot acos (x)
pause -1
plot atan(x) 
pause -1
plot sin(x),cos(x)
pause -1

# commenti
# file scritto con NOTES e salvato come xprova1.txt
# richiamato con GnuPlot e OPEN xprova1.txt
# pause -1 attende pressione INVIO per proseguire

in successione cliccando su OK

file tipo data antartic.dat

file.dem > file.txt

file tipo dem trasformato in file tipo txt e richiamato come file.txt in frontage

#   GNUPLOT v3.6 beta multiplot script file
#
# Second Order System Characteristics
#
#       D**2 + 2*zeta*wn*D + (wn**2)y = (wn**2)*x
#
#   x           input variable
#   y           output variable
#   w           frequency ratio (w/wn)
#   wn          natural frequency
#   wd          damped natural frequency
#   zeta        damping ratio 
#   mag(w)      amplitude response
#   phi(w)      phase response
#   wdwn        damped natural frequency ratio
#   wnt         normalized time
#
#   Plots:
#   Frequency domain    magnitude response
#                           phase response
#
#   Time domain         unit step response
#                       unit impulse response
#
#
# Created by: W. D. Kirby email: wdkirby@ix.netcom.com 
# Date: 1/18/96
# Released to the public domain with no warranty of any kind
#
reset
set function style lines
set size 1.0, 1.0
set origin 0.0, 0.0
set multiplot
set size 0.5,0.5
set origin 0.0,0.5
set grid
set nokey
set angles radians
set samples 250
#  Plot Magnitude Response
set title "Second Order System Transfer Function - Magnitude"
mag(w) = -10*log10( (1-w**2)**2 + 4*(zeta*w)**2)
set dummy w
set logscale x
set xlabel "Frequency (w/wn)"
set ylabel "Magnitude (dB)" 1,0
set label 1 "Damping =.1,.2,.3,.4,.5,.707,1.0,2.0" at .14,17
set xrange [.1:10]
set yrange [-40:20]
plot \
  zeta=.1,mag(w), \
  zeta=.2,mag(w), \
  zeta=.3,mag(w), \
  zeta=.4,mag(w), \
  zeta=.5,mag(w), \
  zeta=.707,mag(w), \
  zeta=1.0,mag(w), \
  zeta=2.0,mag(w),-6
#  Plot Phase Response
set size 0.5,0.5
set origin 0.0,0.0
set title "Second Order System Transfer Function - Phase"
set label 1 ""
set ylabel "Phase (deg)" 1,0
set ytics -180, 30, 0 
set yrange [-180:0]
tmp(w) = (-180/pi)*atan( 2*zeta*w/(1-w**2) )
# Fix for atan function wrap problem
tmp1(w)= w<1?tmp(w):(tmp(w)-180)
phi(w)=zeta==1?(-2*(180/pi)*atan(w)):tmp1(w)
plot \
  zeta=.1,phi(w), \
  zeta=.2,phi(w), \
  zeta=.3,phi(w), \
  zeta=.4,phi(w), \
  zeta=.5,phi(w), \
  zeta=.707,phi(w), \
  zeta=1,phi(w), \
  zeta=2.0,phi(w), \
  -90
#  Plot Step Response
set size 0.5,0.5
set origin 0.5,0.5
set dummy wnt
set nologscale x
set title "Second Order System - Unit Step Response"
set ylabel "Amplitude y(wnt)" 1,0 
set xlabel "Normalized Time (wnt)"
set xrange [0:20]
set xtics 0,5,20
set yrange [0:2.0]
set ytics 0, .5, 2.0
set mytics 5
set mxtics 10
wdwn(zeta)=sqrt(1-zeta**2)
shift(zeta) = atan(wdwn(zeta)/zeta)
alpha(zeta)=zeta>1?sqrt(zeta**2-1.0):0
tau1(zeta)=1/(zeta-alpha(zeta))
tau2(zeta)=1/(zeta+alpha(zeta))
c1(zeta)=(zeta + alpha(zeta))/(2*alpha(zeta))
c2(zeta)=c1(zeta)-1
y1(wnt)=zeta==1?1 - exp(-wnt)*(wnt + 1):0
y2(wnt)=zeta<1?(1 - (exp(-zeta*wnt)/wdwn(zeta))*sin(wdwn(zeta)*wnt + shift(zeta))):y1(wnt)
y(wnt)=zeta>1?1-c1(zeta)*exp(-wnt/tau1(zeta))+c2(zeta)*exp(-wnt/tau2(zeta)):y2(wnt)
plot \
  zeta=.1,y(wnt), \
  zeta=.2,y(wnt), \
  zeta=.3,y(wnt), \
  zeta=.4,y(wnt), \
  zeta=.5,y(wnt), \
  zeta=.707,y(wnt), \
  zeta=1,y(wnt), \
  zeta=2,y(wnt)
#
#  Plot Impulse Response
set origin .5,0.
set title "Second Order System - Unit Impulse Response"
y(wnt)=exp(-zeta*wnt) * sin(wdwn(zeta)*wnt) / wdwn(zeta)
set yrange [-1. :1.]
set ytics -1,.5,1.
plot \
  zeta=.1,y(wnt), \
  zeta=.2,y(wnt), \
  zeta=.3,y(wnt), \
  zeta=.4,y(wnt), \
  zeta=.5,y(wnt), \
  zeta=.707,y(wnt), \
  zeta=1,y(wnt), \
  zeta=2,y(wnt)
set nomultiplot
#
#  Clean up: reset parameter defaults
#
reset

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