Projection function

Author: Goneiross

src/projection.js

@@ -1,4 +1,4 @@
-import { Matrix, WrapperMatrix2D } from './index';
+import { Matrix } from './index';
 
 /**
  * Compute the projection of a vector into a
@@ -7,5 +7,20 @@ import { Matrix, WrapperMatrix2D } from './index';
  * @return {matrix} projection of vector
  */
 export function projection(vector, vectorspace) {
-  return (vector);
+  if (vector.rows < vector.columns) {
+    vector = vector.transpose();
+  }
+  let projVector = Matrix.zeros(vector.rows(), 1);
+  let coef = 1;
+
+  if (vector.rows > 1 && vector.columns > 1) {
+    console.log('ERROR : Vector is not a 1*n vector');
+    return (0);
+  } else {
+    for (let i = 0; i < vectorspace.rows(); i++) {
+      coef = vector.dot(vectorspace.getRow(i)) / vectorspace.getRow(i).dot(vectorspace.getRow(i));
+      projVector += vectorspace.getRow(i).transpose().mulColumn(0, coef);
+    }
+    return (projVector);
+  }
 }