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fix segmented integral

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This commit is contained in:
Alexander Nozik 2021-04-19 11:26:06 +03:00
parent 86818f6864
commit fd4108b74f
3 changed files with 4 additions and 5 deletions
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2
kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegrator.kt
View File

@ -102,7 +102,7 @@ public fun <T : Any> Field<T>.integrate(
require(intervals > 0) { "Number of intervals must be positive" }
val rangeSize = (range.endInclusive - range.start) / intervals
val ranges = UnivariateIntegrandRanges(
(0 until intervals).map { i -> (rangeSize * i)..(rangeSize * i + 1) to order }
(0 until intervals).map { i -> (rangeSize * i)..(rangeSize * (i + 1)) to order }
)
return GaussIntegrator(this).integrate(
UnivariateIntegrand(

4
kmath-functions/src/commonTest/kotlin/space/kscience/kmath/integration/GaussIntegralTest.kt
View File

@ -24,14 +24,14 @@ class GaussIntegralTest {
@Test
fun gaussUniform() {
val res = DoubleField.integrate(0.0..100.0,300) { x ->
val res = DoubleField.integrate(0.0..100.0) { x ->
if(x in 30.0..50.0){
1.0
} else {
0.0
}
}
assertEquals(20.0, res.value!!, 1.0)
assertEquals(20.0, res.value!!, 0.5)
}

3
kmath-nd4j/src/main/kotlin/space/kscience/kmath/nd4j/Nd4jArrayStructure.kt
View File

@ -20,8 +20,7 @@ public sealed class Nd4jArrayStructure<T> : MutableStructureND<T> {
*/
public abstract val ndArray: INDArray
public override val shape: IntArray
get() = ndArray.shape().toIntArray()
public override val shape: IntArray get() = ndArray.shape().toIntArray()
internal abstract fun elementsIterator(): Iterator<Pair<IntArray, T>>
internal fun indicesIterator(): Iterator<IntArray> = ndArray.indicesIterator()