gradient function (internal function)
Numerical gradient for a function at a given value (internal).
grad(func, x, ...)
func |
Function taking a vector argument x (returns a vector of length>=1) |
x |
vector of arguments for where the gradient is wanted. |
... |
other arguments to the function |
(func(x+delta,...)-func(x-delta,...))/(2 delta) where delta is the third root of the machine precision times pmax(1,abs(x)).
A vector if func(x) has length 1, otherwise a matrix with rows for x and columns for func(x).
Mark Clements.
numDelta()
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