interpolation.h File Reference

Provide linear interpolation functions. More...

#include <stdint.h>
#include <math.h>

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Functions
static int32_t	linear_interpolate (const int32_t *x_axis, const int32_t *y_axis, uint8_t len, int32_t x)
	Perform a linear interpolation across an arbitrary curve.

Detailed Description

Provide linear interpolation functions.

Function Documentation

linear_interpolate()

static int32_t linear_interpolate ( const int32_t * x_axis, const int32_t * y_axis, uint8_t len, int32_t x )

inlinestatic

Perform a linear interpolation across an arbitrary curve.

Note

Result rounding occurs away from 0, e.g: 1.5 -> 2, -5.5 -> -6

Parameters

x_axis	Ascending list of X co-ordinates for y_axis data points
y_axis	Y co-ordinates for each X data point
len	Length of the x_axis and y_axis arrays
x	X co-ordinate to lookup

Return values

y_axis[0]	if x < x_axis[0]
y_axis[len	- 1] if x > x_axis[len - 1]
int32_t	Linear interpolation between the two nearest y_axis values.