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### D.5.2 `gsldif` output

The result returned by `library('gsldif',method) (f,x)` or `library('gsldif',method) ((f,t),x)` is an approximation of the first derivative of f evaluated at x.

The result is obtained by the one of the GNU Scientific Library (GSL) functions for numerical differentiation that matches the virtual code function name. These functions are documented in the GSL reference manual. The three methods should have approximately the same results but may differ in numerical properties.

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