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Merge pull request #438 from mipt-npm/commandertvis/411

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Relax type requirements in algebraExtensions.kt from `Ring` to `Group`
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Alexander Nozik 2021-11-16 10:52:41 +03:00 committed by GitHub
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1 changed files with 15 additions and 15 deletions
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30
kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/algebraExtensions.kt
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@ -6,55 +6,55 @@
package space.kscience.kmath.operations
/**
* Returns the sum of all elements in the iterable in this [Ring].
* Returns the sum of all elements in the iterable in this [Group].
*
* @receiver the algebra that provides addition.
* @param data the iterable to sum up.
* @return the sum.
*/
public fun <T> Ring<T>.sum(data: Iterable<T>): T = data.fold(zero) { left, right ->
public fun <T> Group<T>.sum(data: Iterable<T>): T = data.fold(zero) { left, right ->
add(left, right)
}
//TODO replace by sumOf with multi-receivers
/**
* Returns the sum of all elements in the sequence in this [Ring].
* Returns the sum of all elements in the sequence in this [Group].
*
* @receiver the algebra that provides addition.
* @param data the sequence to sum up.
* @return the sum.
*/
public fun <T> Ring<T>.sum(data: Sequence<T>): T = data.fold(zero) { left, right ->
public fun <T> Group<T>.sum(data: Sequence<T>): T = data.fold(zero) { left, right ->
add(left, right)
}
/**
* Returns an average value of elements in the iterable in this [Ring].
* Returns an average value of elements in the iterable in this [Group].
*
* @receiver the algebra that provides addition and division.
* @param data the iterable to find average.
* @return the average value.
* @author Iaroslav Postovalov
*/
public fun <T, S> S.average(data: Iterable<T>): T where S : Ring<T>, S : ScaleOperations<T> =
public fun <T, S> S.average(data: Iterable<T>): T where S : Group<T>, S : ScaleOperations<T> =
sum(data) / data.count()
/**
* Returns an average value of elements in the sequence in this [Ring].
* Returns an average value of elements in the sequence in this [Group].
*
* @receiver the algebra that provides addition and division.
* @param data the sequence to find average.
* @return the average value.
* @author Iaroslav Postovalov
*/
public fun <T, S> S.average(data: Sequence<T>): T where S : Ring<T>, S : ScaleOperations<T> =
public fun <T, S> S.average(data: Sequence<T>): T where S : Group<T>, S : ScaleOperations<T> =
sum(data) / data.count()
/**
* Absolute of the comparable [value]
*/
public fun <T : Comparable<T>> Ring<T>.abs(value: T): T = if (value > zero) value else -value
public fun <T : Comparable<T>> Group<T>.abs(value: T): T = if (value > zero) value else -value
/**
* Returns the sum of all elements in the iterable in provided space.
@ -63,7 +63,7 @@ public fun <T : Comparable<T>> Ring<T>.abs(value: T): T = if (value > zero) valu
* @param group the algebra that provides addition.
* @return the sum.
*/
public fun <T> Iterable<T>.sumWith(group: Ring<T>): T = group.sum(this)
public fun <T> Iterable<T>.sumWith(group: Group<T>): T = group.sum(this)
/**
* Returns the sum of all elements in the sequence in provided space.
@ -72,27 +72,27 @@ public fun <T> Iterable<T>.sumWith(group: Ring<T>): T = group.sum(this)
* @param group the algebra that provides addition.
* @return the sum.
*/
public fun <T> Sequence<T>.sumWith(group: Ring<T>): T = group.sum(this)
public fun <T> Sequence<T>.sumWith(group: Group<T>): T = group.sum(this)
/**
* Returns an average value of elements in the iterable in this [Ring].
* Returns an average value of elements in the iterable in this [Group].
*
* @receiver the iterable to find average.
* @param space the algebra that provides addition and division.
* @return the average value.
* @author Iaroslav Postovalov
*/
public fun <T, S> Iterable<T>.averageWith(space: S): T where S : Ring<T>, S : ScaleOperations<T> =
public fun <T, S> Iterable<T>.averageWith(space: S): T where S : Group<T>, S : ScaleOperations<T> =
space.average(this)
/**
* Returns an average value of elements in the sequence in this [Ring].
* Returns an average value of elements in the sequence in this [Group].
*
* @receiver the sequence to find average.
* @param space the algebra that provides addition and division.
* @return the average value.
* @author Iaroslav Postovalov
*/
public fun <T, S> Sequence<T>.averageWith(space: S): T where S : Ring<T>, S : ScaleOperations<T> =
public fun <T, S> Sequence<T>.averageWith(space: S): T where S : Group<T>, S : ScaleOperations<T> =
space.average(this)