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Changed Polynomial to accept coefficients in reverse order

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This commit is contained in:
Andrius Dagys 2016-04-05 16:47:39 +01:00
parent ec80ddfcd5
commit b728bd3b9d
1 changed files with 6 additions and 2 deletions
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8
core/src/main/kotlin/core/math/Interpolators.kt
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@ -54,15 +54,19 @@ class CubicSplineInterpolator(val xs: DoubleArray, val ys: DoubleArray) {
val segmentMap = TreeMap<Double, Polynomial>()
for (i in 0..n - 1) {
val coefficients = doubleArrayOf(ys[i], b[i], c[i], d[i])
val coefficients = doubleArrayOf(d[i], c[i], b[i], ys[i])
segmentMap.put(xs[i], Polynomial(coefficients))
}
return SplineFunction(segmentMap)
}
}
/**
* Represents a polynomial function of arbitrary degree
* @param coefficients polynomial coefficients in descending order (highest degree first)
*/
class Polynomial(private val coefficients: DoubleArray) {
fun getValue(x: Double) = coefficients.reversed().fold(0.0, { result, c -> result * x + c })
fun getValue(x: Double) = coefficients.fold(0.0, { result, c -> result * x + c })
}
/**