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Upgrade AutoDiff support of trigonometric ops, also fix some problems with MstAlgebra #140

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CommanderTvis merged 5 commits from autodiff-update into dev 2020-09-20 18:21:37 +03:00
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1 changed files with 6 additions and 6 deletions
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kmath-core/src/commonTest/kotlin/scientifik/kmath/misc/AutoDiffTest.kt
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@ -202,24 +202,24 @@ class AutoDiffTest {
fun testSinh() { fun testSinh() {
val x = Variable(0.0) val x = Variable(0.0)
val y = deriv { sinh(x) } val y = deriv { sinh(x) }
assertApprox(kotlin.math.sinh(0.0), y.value) // y = sinh(pi/6) assertApprox(kotlin.math.sinh(0.0), y.value) // y = sinh(0)
assertApprox(kotlin.math.cosh(0.0), y.deriv(x)) // dy/dx = cosh(pi/6) assertApprox(kotlin.math.cosh(0.0), y.deriv(x)) // dy/dx = cosh(0)
} }
@Test @Test
fun testCosh() { fun testCosh() {
val x = Variable(0.0) val x = Variable(0.0)
val y = deriv { cosh(x) } val y = deriv { cosh(x) }
assertApprox(1.0, y.value) //y = cosh(pi/6) assertApprox(1.0, y.value) //y = cosh(0)
assertApprox(0.0, y.deriv(x)) // dy/dx = sinh(pi/6) assertApprox(0.0, y.deriv(x)) // dy/dx = sinh(0)
} }
@Test @Test
fun testTanh() { fun testTanh() {
val x = Variable(PI / 6) val x = Variable(PI / 6)
val y = deriv { tanh(x) } val y = deriv { tanh(x) }
assertApprox(1.0 / sqrt(3.0), y.value) // y = tan(pi/6) = 1/sqrt(3) assertApprox(1.0 / sqrt(3.0), y.value) // y = tanh(pi/6)
assertApprox(1.0 / kotlin.math.cosh(PI / 6.0).pow(2), y.deriv(x)) // dy/dx = sec(PI/6)^2 assertApprox(1.0 / kotlin.math.cosh(PI / 6.0).pow(2), y.deriv(x)) // dy/dx = sech(pi/6)^2
} }
@Test @Test