File: g_margin.cat

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g_margin(1)                    Scilab Function                    g_margin(1)
NAME
  g_margin - gain margin

CALLING SEQUENCE
  [gm [,fr]]=g_margin(h)

PARAMETERS

  h    : syslin list representing a linear system in state-space or transfer
       form

DESCRIPTION
  returns gm, the gain margin in dB of h (SISO plant) and fr, the achieved
  corresponding frequency in hz.  The gain margin is values of the system
  gain at points where the nyquist plot crosses the negative real axis.

EXAMPLE
  h=syslin('c',-1+%s,3+2*%s+%s^2)
  [g,fr]=g_margin(h)
  [g,fr]=g_margin(h-10)
  nyquist(h-10)

SEE ALSO
  p_margin, black, chart, nyquist