Add prototype of projection function

To use it in positiveLinearCombination

src/index.js

@@ -23,3 +23,4 @@ export {
 export { default as LuDecomposition, default as LU } from './dc/lu.js';
 export { default as QrDecomposition, default as QR } from './dc/qr.js';
 export { default as NNMFDecomposition, default as NNMF } from './dc/nnmf.js';
+export { projection } from './projection';

src/projection.js

@@ -0,0 +1,11 @@
+import { Matrix, WrapperMatrix2D } from './index';
+
+/**
+ * Compute the projection of a vector into a
+ * @param {matrix} vector
+ * @param {matrix} vectorspace
+ * @return {matrix} projection of vector
+ */
+export function projection(vector, vectorspace) {
+  return (vector);
+}