File: sgrid.cat

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sgrid(1)                       Scilab Function                       sgrid(1)
NAME
  sgrid - s-plane grid lines.

CALLING SEQUENCE
  sgrid()
  sgrid('new')
  sgrid(zeta,wn [,color])

DESCRIPTION
  Used in conjonction with evans, plots lines of constant damping ratio
  (zeta) and natural frequency (wn).

       sgrid()
         : add a grid over an existing continuous s-plane root with default
         values for zeta and wn.

       sgrid('new')
         : clears the graphic screen and then plots a default s-plane grid

       sgrid(zeta,wn [,color])
         : same as sgrid() but uses the provided damping ratio and natural
         frequency.

EXAMPLE
  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)

SEE ALSO
  evans