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phasemag Scilab Group Scilab Function phasemag
NAME
phasemag - phase and magnitude computation
CALLING SEQUENCE
[phi,db]=phasemag(z [,mod])
PARAMETERS
z : matrix or row vector of complex numbers.
mod : character string
mod='c' : "continuous" representation between -infinity and +360
degrees (default)
mod='m' : representation between -360 and 0 degrees
phi : phases (in degree) of z.
db : magnitude (in Db)
DESCRIPTION
phasemag computes the phases and magnitudes of the entries of a complex
matrix. For mod='c' phasemag computes phi(:,i+1) to minimize the
distance with phi(:,i), i.e. it tries to obtain a "continuous
representation" of the phase. To obtain the phase between -%pi and %pi
use phi=atan(imag(z),real(z))
EXAMPLE
s=poly(0,'s');
h=syslin('c',1/((s+5)*(s+10)*(100+6*s+s*s)*(s+.3)));
[frq,rf]=repfreq(h,0.1,20,0.005);
xbasc(0);
plot2d(frq',phasemag(rf,'c')');
xbasc(1);
plot2d(frq',phasemag(rf,'m')');
SEE ALSO
repfreq, gainplot, atan, bode
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