I have read that when the gradient function is not supplied (is null) then first order differencing is used to find the differential. I was trying to track down this for my own information but I run into .Internal(optim.....). I was not sure where to look next to see the function that is automatically supplied for the gradient. Thank you. Kevin
Gradient function for optim.
2 messages · rkevinburton at charter.net, Katharine Mullen
see the fmingr function in src/main/optim.c (https://svn.r-project.org/R/trunk/src/main/optim.c)
On Wed, 25 Feb 2009 rkevinburton at charter.net wrote:
I have read that when the gradient function is not supplied (is null) then first order differencing is used to find the differential. I was trying to track down this for my own information but I run into .Internal(optim.....). I was not sure where to look next to see the function that is automatically supplied for the gradient. Thank you. Kevin
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