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bode(1) Scilab Function bode(1)
NAME
bode - Bode plot
CALLING SEQUENCE
bode(sl,[fmin,fmax] [,step] [,comments] )
bode(sl,frq [,comments] )
bode(frq,db,phi [,comments])
bode(frq, repf [,comments])
PARAMETERS
sl : syslin list (SISO or SIMO linear system) in continuous or
discrete time.
fmin,fmax : real (frequency bounds (in Hz))
step : real (logarithmic step.)
comments : vector of character strings (captions).
frq : row vector or matrix (frequencies (in Hz) ) (one row for
each SISO subsystem).
db : row vector or matrix ( magnitudes (in Db)). (one row for
each SISO subsystem).
phi : row vector or matrix ( phases (in degree)) (one row for
each SISO subsystem).
repf : row vector or matrix of complex numbers (complex frequency
response).
DESCRIPTION
Bode plot, i.e magnitude and phase of the frequency response of sl.
sl can be a continuous-time or discrete-time SIMO system (see syslin). In
case of multi-output the outputs are plotted with different symbols.
The frequencies are given by the bounds fmin,fmax (in Hz) or by a row-
vector (or a matrix for multi-output) frq.
step is the ( logarithmic ) discretization step. (see calfrq for the choice
of default value).
comments is a vector of character strings (captions).
db,phi are the matrices of modulus (in Db) and phases (in degrees). (One
row for each response).
repf matrix of complex numbers. One row for each response.
Default values for fmin and fmax are 1.d-3, 1.d+3 if sl is continuous-time
or 1.d-3, 0.5 if sl is discrete-time. Automatic discretization of frequen-
cies is made by calfrq.
EXAMPLE
s=poly(0,'s')
h=syslin('c',(s^2+2*0.9*10*s+100)/(s^2+2*0.3*10.1*s+102.01))
title='(s^2+2*0.9*10*s+100)/(s^2+2*0.3*10.1*s+102.01)';
bode(h,0.01,100,title);
h1=h*syslin('c',(s^2+2*0.1*15.1*s+228.01)/(s^2+2*0.9*15*s+225))
xbasc()
bode([h1;h],0.01,100,['h1';'h'])
SEE ALSO
black, nyquist, gainplot, repfreq, g_margin, p_margin, calfrq, phasemag
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