====== Compatibility ======

===== Subcircuit with parameters =====

Some simulators (LTspice, Pspice) accept a syntax for subcircuits that is incompatible with gnucap.

==== Subcircuit instantiation syntax ====

LTspice syntax:

  Xv   v1r v1i      vri_slack params: ( vr=10  vi=1  on=1 vfactor=1.732 )
  Ximp v1r v1i 0 0  impedance params: ( r=1 xl=10 xc=2 length=1 zfactor=1 )

The key ''params:'' should be omitted.\\
Gnucap syntax:

  Xv   v1r v1i      vri_slack ( vr=10  vi=1  on=1 vfactor=1.732 )
  Ximp v1r v1i 0 0  impedance ( r=1 xl=10 xc=2 length=1 zfactor=1 )

==== Subcircuit declaration syntax ====

LTspice syntax:

  .subckt impedance v1r v1i v2r v2i
  + params:
  + on = 1
  + r = 100
  + xl = 0

  .subckt impedance v1r v1i v2r v2i params: on = 1 r = 100 xl = 0

The list of parameters is not accepted on the header line.  Instead, list the parameters with .param statements on following lines.\\
Gnucap syntax:

  .subckt impedance v1r v1i v2r v2i
  .param
  + on = 1
  + r = 100
  + xl = 0

  .subckt impedance v1r v1i v2r v2i
  .param on = 1 r = 100 xl = 0