lambda_to_theta_ARMA_03 = function(lambda1m,lambda0,lambda1){
#
# Written by:
# -- 
# John L. Weatherwax                2009-04-21
# 
# email: wax@alum.mit.edu
# 
# Please send comments and especially bug reports to the
# above email address.
# 
#-----

theta1 = 2 - lambda1m - lambda0 - lambda1 
theta2 = lambda0 + 2 * lambda1m - 1
theta3 = lambda1m

return( c(theta1,theta2,theta3) )
  
}