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ENH: Allow `Splinterpolator` instances to be created from an existing set of spline coefficients, and extend extrapolation options

Paul McCarthy requested to merge enh/splinterpolator into master
  • The Splinterpolator class can now accept a pointer to an array of pre-calculated coefficients - in this case, a copy of the pointer is used (the data is not copied), and pre-filtering (coefficient calculation) is skipped
  • New SoftZeros extrapolation method - out of bounds coefficients will be set to zero, but out-of-bounds coordinates will still be constructed via interpolation. This differs from the existing Zeros extrapolation method, where out-of-bounds coordinates are forced to zero.
  • Adjustment to the coefficient initialisation method used when Constant extrapolation is requested; previously, a mirroring boundary condition was used.
  • New Splinterpolator::Copy function, which allows the spline coefficients to be copied/extracted.
Edited by Paul McCarthy

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