# ElementwiseProduct

ElementwiseProduct multiplies each input vector by a provided “weight” vector, using element-wise multiplication. In other words, it scales each column of the dataset by a scalar multiplier. This represents the Hadamard product between the input vector, v and transforming vector, w, to yield a result vector.

```
import org.apache.spark.ml.feature.ElementwiseProduct
import org.apache.spark.ml.linalg.Vectors
// Create some vector data; also works for sparse vectors
val dataFrame = spark.createDataFrame(Seq(
("a", Vectors.dense(1.0, 2.0, 3.0)),
("b", Vectors.dense(4.0, 5.0, 6.0)))).toDF("id", "vector")
val transformingVector = Vectors.dense(0.0, 1.0, 2.0)
val transformer = new ElementwiseProduct()
.setScalingVec(transformingVector)
.setInputCol("vector")
.setOutputCol("transformedVector")
// Batch transform the vectors to create new column:
transformer.transform(dataFrame).show()
/*
Output:
+---+-------------+-----------------+
| id|       vector|transformedVector|
+---+-------------+-----------------+
|  a|[1.0,2.0,3.0]|    [0.0,2.0,6.0]|
|  b|[4.0,5.0,6.0]|   [0.0,5.0,12.0]|
+---+-------------+-----------------+

*/
```


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