Dear all,
 
With reference to the optim R documentation, parscale definition seems to say  
that if e.g. Śf(x+1,y) - f(x,y)Ś and Śf(x,y+1) - f(x,y)Ś are not of comparable magnitude
then we should set the parscale argument.
 
But then I was wondering why parscale is set to 20 in the "wild" function example. This function has only one parameter and if we set parscale equal to 1 then the solution near the global minimum is not found.
 
Many thanks in advance to all of you and kind regards,
Tom



__________________________________________________



	[[alternative HTML version deleted]]


