type
  PFitData=^TFitData;
  TFitData=record
    t:Pdouble;
    y:Pdouble;
    n:Integer;
  end;
 
function market(alpha,kappa, t:double):double;
begin
  result:=alpha*exp(-kappa*t);
end;
 
function func_f(x: Pgsl_vector; params: Pointer; f: Pgsl_vector): Integer;cdecl;
var
  data:PFitData;
  alpha:double;
  kappa:double;
  i:Integer;
  t,yi,y:double;
begin
  data:= PFitData(params);
  alpha := gsl_vector_get(x, 0);

def rotate(ent, axis, angle)
    rv = ent.transformation.zaxis if axis == "z"
    rv = ent.transformation.yaxis if axis == "y"
    rv = ent.transformation.xaxis if axis == "x"
    rp = ent.transformation.origin
    ent.transform!(Geom::Transformation.rotation(rp, rv, angle))
end
 
 
mod = Sketchup.active_model # Open model
ent = mod.entities # All entities in model
sel = mod.selection # Current selection
 
componame="abc"
compo = Sketchup.active_model.definitions[componame]
if compo
  puts "#{componame} found: doing something else..."