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.TH phasemag 1 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
phasemag - phase and magnitude computation
.SH CALLING SEQUENCE
.nf
[phi,db]=phasemag(z [,mod])
.fi
.SH PARAMETERS
.TP
z
: matrix or row vector of complex numbers.
.TP
mod
: character string
.RS
.TP 10
mod='c'
: "continuous" representation between -infinity and +360 degrees (default)
.TP
mod='m'
: representation between -360 and 0 degrees
.RE
.TP
phi
: phases (in degree) of \fVz\fR.
.TP
db
: magnitude (in Db)
.SH DESCRIPTION
\fVphasemag\fR computes the phases and magnitudes of the entries of
a complex matrix. For \fVmod='c'\fR
\fVphasemag\fR computes \fVphi(:,i+1)\fR to minimize the
distance with \fVphi(:,i)\fR, i.e. it tries to obtain a
"continuous representation" of the phase.
To obtain the phase between -%pi and %pi use \fVphi=atan(imag(z),real(z))\fR
.SH EXAMPLE
.nf
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')');
.fi
.SH SEE ALSO
repfreq, gainplot, atan, bode
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