*If(strcmp(MatProp(Spring_Non-Linearity),"NONLINEAR")==0)

FUNCTION ID *Operation(matvar) // *Operation(MatNum*IncrAdvancedFunID+1)
  NAME "Material spring *MatProp(0)"
  TYPE "CCMultiLinearFunction" REMOVE_ALL 
  xvalues *\
*for(i=2;i<=MatProp(F_of_Eps_diagram,Int);i=i+2)
  *MatProp(F_of_Eps_diagram,*i) *\
*End

  yvalues *\
*for(i=1;i<=MatProp(F_of_Eps_diagram,Int);i=i+2)
  *MatProp(F_of_Eps_diagram,*i) *\
*End
 ;
*Else
// linear Function of spring *MatProp(0)
*EndIf
