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D.5.1 gsldif input parameters

The argument to the functions with mnemonics of backward, central or forward is a pair (f,x), where f is the virtual machine code for a real valued function of a real variable, and x is the input to f where the derivative is sought. Real numbers are represented according to math.

The argument to the functions with mnemonics of t_backward, t_central or t_forward is a pair ((f,t),x), where f and x are as above, and t is a tolerance represented as a floating point number. The tolerance is passed through to the GNU Scientific library (GSL) differentiation routines.

When no tolerance is specified, the default is 1.0e-8.