Added matrix builder for small matrices
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@ -107,26 +107,6 @@ interface GenericMatrixContext<T : Any, R : Ring<T>> : MatrixContext<T> {
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produce(rowNum, colNum) { i, j -> elementContext.run { get(i, j) * value } }
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}
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/**
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* A marker interface representing some matrix feature like diagonal, sparce, zero, etc. Features used to optimize matrix
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* operations performance in some cases.
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*/
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interface MatrixFeature
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object DiagonalFeature : MatrixFeature
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object ZeroFeature : MatrixFeature
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object UnitFeature : MatrixFeature
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interface InverseMatrixFeature<T : Any> : MatrixFeature {
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val inverse: Matrix<T>
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}
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interface DeterminantFeature<T : Any> : MatrixFeature {
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val determinant: T
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}
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/**
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* Specialized 2-d structure
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*/
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@ -173,6 +153,16 @@ interface Matrix<T : Any> : NDStructure<T> {
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val buffer = elements.asBuffer()
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return BufferMatrix(size, size, buffer)
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}
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fun <T : Any> build(rows: Int, columns: Int): MatrixBuilder<T> = MatrixBuilder(rows, columns)
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}
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}
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class MatrixBuilder<T : Any>(val rows: Int, val columns: Int) {
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operator fun invoke(vararg elements: T): Matrix<T> {
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if (rows * columns != elements.size) error("The number of elements ${elements.size} is not equal $rows * $columns")
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val buffer = elements.asBuffer()
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return BufferMatrix(rows, columns, buffer)
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}
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}
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@ -0,0 +1,30 @@
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package scientifik.kmath.linear
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/**
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* A marker interface representing some matrix feature like diagonal, sparce, zero, etc. Features used to optimize matrix
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* operations performance in some cases.
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*/
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interface MatrixFeature
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/**
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* The matrix with this feature is considered to have only diagonal non-null elements
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*/
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object DiagonalFeature : MatrixFeature
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/**
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* Matix with this feature has all zero elements
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*/
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object ZeroFeature : MatrixFeature
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/**
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* Matrix with this feature have unit elements on diagonal and zero elements in all other places
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*/
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object UnitFeature : MatrixFeature
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interface InverseMatrixFeature<T : Any> : MatrixFeature {
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val inverse: Matrix<T>
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}
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interface DeterminantFeature<T : Any> : MatrixFeature {
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val determinant: T
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}
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@ -41,4 +41,14 @@ class MatrixTest {
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assertEquals(5.0, product[1, 0])
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assertEquals(6.0, product[2, 2])
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}
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@Test
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fun testBuilder() {
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val matrix = Matrix.build<Double>(2, 3)(
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1.0, 0.0, 0.0,
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0.0, 1.0, 2.0
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)
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assertEquals(2.0, matrix[1, 2])
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}
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}
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@ -8,8 +8,12 @@ repositories {
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kotlin {
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jvm {
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compilations["main"].kotlinOptions.jvmTarget = "1.8"
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compilations["test"].kotlinOptions.jvmTarget = "1.8"
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compilations.all {
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kotlinOptions {
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jvmTarget = "1.8"
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freeCompilerArgs += "-progressive"
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}
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}
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}
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js()
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