Combined Evaluation and Split Access of Functions
Access a list of values separately but calculate them together. This f...
Split function and gradient calculation
Use splitfngr with lbfgs
Convert a function from multiple function arguments to a single functi...
Use splitfngr with nlminb
Use splitfngr with optim
Some R functions, such as optim(), require a function its gradient passed as separate arguments. When these are expensive to calculate it may be much faster to calculate the function (fn) and gradient (gr) together since they often share many calculations (chain rule). This package allows the user to pass in a single function that returns both the function and gradient, then splits (hence 'splitfngr') them so the results can be accessed separately. The functions provided allow this to be done with any number of functions/values, not just for functions and gradients.