forked from kscience/kmath
Remove power overriding and algebraic stub.
This commit is contained in:
Gleb Minaev
parent
99c7174802
commit
2d86cf1cc7
@ -247,10 +247,6 @@ public open class PolynomialSpace<C, A>(
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)
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}
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}
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/**
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* Raises [arg] to the integer power [exponent].
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*/ // TODO: To optimize boxing
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override fun power(arg: Polynomial<C>, exponent: UInt): Polynomial<C> = exponentiateBySquaring(arg, exponent)
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/**
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* Instance of zero polynomial (zero of the polynomial ring).
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@ -1,51 +0,0 @@
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/*
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* Copyright 2018-2021 KMath contributors.
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* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
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*/
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package space.kscience.kmath.functions
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import space.kscience.kmath.operations.*
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// TODO: All of this should be moved to algebraic structures' place for utilities
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// FIXME: Move receiver to context receiver
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/**
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* Raises [arg] to the integer power [exponent].
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*
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* This is implementation of variation of [exponentiation by squaring](https://en.wikipedia.org/wiki/Exponentiation_by_squaring)
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*
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* @param arg the base of the power.
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* @param exponent the exponent of the power.
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* @return [arg] raised to the power [exponent].
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* @author Gleb Minaev
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*/
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internal tailrec fun <C> Ring<C>.exponentiateBySquaring(arg: C, exponent: UInt): C =
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when {
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exponent == 0u -> zero
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exponent == 1u -> arg
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exponent and 1u == 0u -> exponentiateBySquaring(arg * arg, exponent shr 1)
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exponent and 1u == 1u -> multiplyExponentiatedBySquaring(arg, arg * arg, exponent shr 1)
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else -> error("Error in multiplication group instant by unsigned integer: got reminder by division by 2 different from 0 and 1")
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}
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// FIXME: Move receiver to context receiver
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/**
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* Multiplies [base] and [arg] raised to the integer power [exponent].
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*
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* This is implementation of variation of [exponentiation by squaring](https://en.wikipedia.org/wiki/Exponentiation_by_squaring)
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*
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* @param base the multiplicand.
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* @param arg the base of the power.
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* @param exponent the exponent of the power.
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* @return product of [base] and [arg] raised to the power [exponent].
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* @author Gleb Minaev
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*/
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internal tailrec fun <C> RingOps<C>.multiplyExponentiatedBySquaring(base: C, arg: C, exponent: UInt): C =
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when {
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exponent == 0u -> base
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exponent == 1u -> base * arg
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exponent and 1u == 0u -> multiplyExponentiatedBySquaring(base, arg * arg, exponent shr 1)
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exponent and 1u == 1u -> multiplyExponentiatedBySquaring(base * arg, arg * arg, exponent shr 1)
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else -> error("Error in multiplication group instant by unsigned integer: got reminder by division by 2 different from 0 and 1")
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}
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@ -1,129 +0,0 @@
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/*
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* Copyright 2018-2021 KMath contributors.
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* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
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*/
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package space.kscience.kmath.functions
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import space.kscience.kmath.operations.invoke
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import space.kscience.kmath.operations.Field
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import kotlin.jvm.JvmInline
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import kotlin.test.Test
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import kotlin.test.assertEquals
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@JvmInline
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value class Expr(val expr: String)
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object ExprRing : Field<Expr> {
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override fun Expr.unaryMinus(): Expr = Expr("-${expr}")
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override fun add(left: Expr, right: Expr): Expr = Expr("(${left.expr} + ${right.expr})")
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override fun multiply(left: Expr, right: Expr): Expr = Expr("(${left.expr} * ${right.expr})")
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override val zero: Expr = Expr("0")
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override val one: Expr = Expr("1")
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override fun divide(left: Expr, right: Expr): Expr = Expr("(${left.expr} / ${right.expr})")
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override fun scale(a: Expr, value: Double): Expr = Expr("(${a.expr} / $value)")
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}
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class AlgebraicStubTest {
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@Test
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fun test_multiplyExponentiationBySquaring_for_UInt() {
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ExprRing {
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assertEquals(
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"57",
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multiplyExponentiatedBySquaring(Expr("57"), Expr("179"), 0u).expr,
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"tried multiplyExponentiationBySquaring(57, 179, 0u)"
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)
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assertEquals(
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"(57 * 179)",
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multiplyExponentiatedBySquaring(Expr("57"), Expr("179"), 1u).expr,
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"tried multiplyExponentiationBySquaring(57, 179, 1u)"
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)
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assertEquals(
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"(57 * (179 * 179))",
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multiplyExponentiatedBySquaring(Expr("57"), Expr("179"), 2u).expr,
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"tried multiplyExponentiationBySquaring(57, 179, 2u)"
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)
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assertEquals(
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"((57 * 179) * (179 * 179))",
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multiplyExponentiatedBySquaring(Expr("57"), Expr("179"), 3u).expr,
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"tried multiplyExponentiationBySquaring(57, 179, 3u)"
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)
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assertEquals(
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"(57 * ((179 * 179) * (179 * 179)))",
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multiplyExponentiatedBySquaring(Expr("57"), Expr("179"), 4u).expr,
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"tried multiplyExponentiationBySquaring(57, 179, 4u)"
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)
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assertEquals(
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"((57 * 179) * ((179 * 179) * (179 * 179)))",
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multiplyExponentiatedBySquaring(Expr("57"), Expr("179"), 5u).expr,
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"tried multiplyExponentiationBySquaring(57, 179, 5u)"
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)
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assertEquals(
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"((57 * (179 * 179)) * ((179 * 179) * (179 * 179)))",
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multiplyExponentiatedBySquaring(Expr("57"), Expr("179"), 6u).expr,
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"tried multiplyExponentiationBySquaring(57, 179, 6u)"
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)
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assertEquals(
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"(((57 * 179) * (179 * 179)) * ((179 * 179) * (179 * 179)))",
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multiplyExponentiatedBySquaring(Expr("57"), Expr("179"), 7u).expr,
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"tried multiplyExponentiationBySquaring(57, 179, 7u)"
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)
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assertEquals(
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"(57 * (((179 * 179) * (179 * 179)) * ((179 * 179) * (179 * 179))))",
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multiplyExponentiatedBySquaring(Expr("57"), Expr("179"), 8u).expr,
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"tried multiplyExponentiationBySquaring(57, 179, 8u)"
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)
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}
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}
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@Test
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fun test_exponentiationBySquaring_for_UInt() {
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ExprRing {
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assertEquals(
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"0",
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exponentiateBySquaring(Expr("57"), 0u).expr,
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"tried exponentiationBySquaring(57, 0u)"
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)
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assertEquals(
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"57",
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exponentiateBySquaring(Expr("57"), 1u).expr,
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"tried exponentiationBySquaring(57, 1u)"
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)
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assertEquals(
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"(57 * 57)",
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exponentiateBySquaring(Expr("57"), 2u).expr,
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"tried exponentiationBySquaring(57, 2u)"
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)
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assertEquals(
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"(57 * (57 * 57))",
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exponentiateBySquaring(Expr("57"), 3u).expr,
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"tried exponentiationBySquaring(57, 3u)"
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)
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assertEquals(
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"((57 * 57) * (57 * 57))",
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exponentiateBySquaring(Expr("57"), 4u).expr,
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"tried exponentiationBySquaring(57, 4u)"
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)
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assertEquals(
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"(57 * ((57 * 57) * (57 * 57)))",
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exponentiateBySquaring(Expr("57"), 5u).expr,
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"tried exponentiationBySquaring(57, 5u)"
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)
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assertEquals(
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"((57 * 57) * ((57 * 57) * (57 * 57)))",
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exponentiateBySquaring(Expr("57"), 6u).expr,
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"tried exponentiationBySquaring(57, 6u)"
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)
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assertEquals(
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"((57 * (57 * 57)) * ((57 * 57) * (57 * 57)))",
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exponentiateBySquaring(Expr("57"), 7u).expr,
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"tried exponentiationBySquaring(57, 7u)"
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)
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assertEquals(
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"(((57 * 57) * (57 * 57)) * ((57 * 57) * (57 * 57)))",
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exponentiateBySquaring(Expr("57"), 8u).expr,
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"tried exponentiationBySquaring(57, 8u)"
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)
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}
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}
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}
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