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.

Examples

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 ,