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30 lines
897 B
30 lines
897 B
3 years ago
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//
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// Created by Nicholas Newdigate on 24/05/2021.
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//
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#ifndef TEENSY_RESAMPLING_SDREADER_INTERPOLATION_H
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#define TEENSY_RESAMPLING_SDREADER_INTERPOLATION_H
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#include <cinttypes>
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#include <math.h>
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enum ResampleInterpolationType {
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resampleinterpolation_none = 1,
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resampleinterpolation_linear = 2,
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resampleinterpolation_quadratic = 3,
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};
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struct InterpolationData
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{
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int16_t x, y;
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};
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// https://en.wikipedia.org/wiki/Lagrange_polynomial
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// https://www.geeksforgeeks.org/lagranges-interpolation/
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// function to interpolate the given data points using Lagrange's formula
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// xi corresponds to the new data point whose value is to be obtained
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// n represents the number of known data points
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int16_t interpolate(InterpolationData *f, double xi, int n);
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int16_t fastinterpolate(int16_t d1, int16_t d2, int16_t d3, int16_t d4, float x);
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#endif //TEENSY_RESAMPLING_SDREADER_INTERPOLATION_H
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