Dear all,
With reference to the optim R documentation, parscale definition seems to say
that if e.g. ¦f(x+1,y) - f(x,y)¦ and ¦f(x,y+1) - f(x,y)¦ 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
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