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DenseMatrix對象中有應用方法,允許從行(微風0.11.2)構造DenseMatrix。像下面的例子:來自DenseVector複製的DenseMatrix
val dv:DenseVector[Double]
DenseMatrix.apply[DenseVector[Double],Double](
(for(i <- 0 until dv.activeSize)yield dv) :_ *)
的麻煩,這樣的代碼需要額外的隱含
implicit val rl = new LiteralRow[DenseVector[Double], Double] {
override def foreach[X](row: DenseVector[Double], fn: (Int, Double) => X): Unit = {
for(i<- 0 until row.iterableSize) {
fn(i, row(i))
}
}
override def length(row: DenseVector[Double]): Int = row.iterableSize
}
任何simplier /更正確的方法呢?