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.TH sgrid 1 "Jun 1997" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
sgrid - s-plane grid lines.
.SH CALLING SEQUENCE
.nf
sgrid()
sgrid('new')
sgrid(zeta,wn [,color])
.fi
.SH DESCRIPTION
Used in conjonction with evans,
plots lines of constant damping ratio (\fVzeta\fR)
and natural frequency (\fVwn\fR).
.RS
.TP
sgrid()
: add a grid over an existing continuous s-plane root
with default values for \fVzeta\fR and \fVwn\fR.
.TP
sgrid('new')
: clears the graphic screen and then plots a default
s-plane grid
.TP
sgrid(zeta,wn [,color])
: same as \fVsgrid()\fR but uses the provided damping ratio and
natural frequency.
.RE
.SH EXAMPLE
.nf
H=syslin('c',352*poly(-5,'s')/poly([0,0,2000,200,25,1],'s','c'));
evans(H,100)
sgrid()
sgrid(0.6,2,7)
.fi
.SH SEE ALSO
evans
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