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Optimized Field for DoubleBuffer operations.

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This commit is contained in:
Alexander Nozik 2019-02-10 09:11:58 +03:00
parent 58a22e4338
commit f6cc23ce0a
2 changed files with 65 additions and 0 deletions
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59
kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/RealBufferField.kt Normal file
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@ -0,0 +1,59 @@
package scientifik.kmath.structures
import scientifik.kmath.operations.Field
/**
* A simple field over linear buffers of [Double]
*/
class RealBufferField(val size: Int) : Field<Buffer<Double>> {
override val zero: Buffer<Double> = Buffer.DoubleBufferFactory(size) { 0.0 }
override val one: Buffer<Double> = Buffer.DoubleBufferFactory(size) { 1.0 }
override fun add(a: Buffer<Double>, b: Buffer<Double>): DoubleBuffer {
require(a.size == size) { "The size of buffer is ${a.size} but context requires $size " }
require(b.size == size) { "The size of buffer is ${b.size} but context requires $size " }
return if (a is DoubleBuffer && b is DoubleBuffer) {
val aArray = a.array
val bArray = b.array
DoubleBuffer(DoubleArray(size) { aArray[it] + bArray[it] })
} else {
DoubleBuffer(DoubleArray(size) { a[it] + b[it] })
}
}
override fun multiply(a: Buffer<Double>, k: Number): DoubleBuffer {
require(a.size == size) { "The size of buffer is ${a.size} but context requires $size " }
val kValue = k.toDouble()
return if (a is DoubleBuffer) {
val aArray = a.array
DoubleBuffer(DoubleArray(size) { aArray[it] * kValue })
} else {
DoubleBuffer(DoubleArray(size) { a[it] * kValue })
}
}
override fun multiply(a: Buffer<Double>, b: Buffer<Double>): DoubleBuffer {
require(a.size == size) { "The size of buffer is ${a.size} but context requires $size " }
require(b.size == size) { "The size of buffer is ${b.size} but context requires $size " }
return if (a is DoubleBuffer && b is DoubleBuffer) {
val aArray = a.array
val bArray = b.array
DoubleBuffer(DoubleArray(size) { aArray[it] * bArray[it] })
} else {
DoubleBuffer(DoubleArray(size) { a[it] * b[it] })
}
}
override fun divide(a: Buffer<Double>, b: Buffer<Double>): DoubleBuffer {
require(a.size == size) { "The size of buffer is ${a.size} but context requires $size " }
require(b.size == size) { "The size of buffer is ${b.size} but context requires $size " }
return if (a is DoubleBuffer && b is DoubleBuffer) {
val aArray = a.array
val bArray = b.array
DoubleBuffer(DoubleArray(size) { aArray[it] / bArray[it] })
} else {
DoubleBuffer(DoubleArray(size) { a[it] / b[it] })
}
}
}

6
kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/SpecializedStructures.kt
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@ -36,6 +36,12 @@ fun <T> NDStructure<T>.as1D(): Structure1D<T> = if (shape.size == 1) {
error("Can't create 1d-structure from ${shape.size}d-structure")
}
fun <T> NDBuffer<T>.as1D(): Structure1D<T> = if (shape.size == 1) {
Buffer1DWrapper(this.buffer)
} else {
error("Can't create 1d-structure from ${shape.size}d-structure")
}
/**
* A structure wrapper for buffer
*/