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## D.5 `gsldif`

Numerical differentiation of a real valued function of a single real variable can be done by a library function of the form

    library('gsldif',method)

where `method` is one of

- `'backward'`
- `'central'`
- `'forward'`
- `'t_backward'`
- `'t_central'`
- `'t_forward'`

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