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The interpolation function for a given dataset is stored in a
`gsl_interp`

object. These are created by the following functions.

- Function:
*gsl_interp ****gsl_interp_alloc***(const gsl_interp_type **`T`, size_t`size`) -
This function returns a pointer to a newly allocated interpolation object of type

`T`for`size`data-points.

- Function:
*int***gsl_interp_init***(gsl_interp **`interp`, const double`xa`[], const double`ya`[], size_t`size`) This function initializes the interpolation object

`interp`for the data (`xa`,`ya`) where`xa`and`ya`are arrays of size`size`. The interpolation object (`gsl_interp`

) does not save the data arrays`xa`and`ya`and only stores the static state computed from the data. The`xa`data array is always assumed to be strictly ordered, with increasing*x*values; the behavior for other arrangements is not defined.

- Function:
*void***gsl_interp_free***(gsl_interp **`interp`) This function frees the interpolation object

`interp`.