| #------------------------------------------------------------- |
| # |
| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you under the Apache License, Version 2.0 (the |
| # "License"); you may not use this file except in compliance |
| # with the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, |
| # software distributed under the License is distributed on an |
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| # KIND, either express or implied. See the License for the |
| # specific language governing permissions and limitations |
| # under the License. |
| # |
| #------------------------------------------------------------- |
| |
| # Implements set intersection for numeric data |
| |
| |
| # INPUT PARAMETERS: |
| # --------------------------------------------------------------------------------------------- |
| # NAME TYPE DEFAULT MEANING |
| # --------------------------------------------------------------------------------------------- |
| # X Double --- matrix X, set A |
| # Y Double --- matrix Y, set B |
| # --------------------------------------------------------------------------------------------- |
| |
| # Output(s) |
| # --------------------------------------------------------------------------------------------- |
| # NAME TYPE DEFAULT MEANING |
| # --------------------------------------------------------------------------------------------- |
| # R Double --- intersection matrix, set of intersecting items |
| |
| m_intersect = function(Matrix[Double] X, Matrix[Double] Y) |
| return(Matrix[Double] R) |
| { |
| # compute indicator vector of intersection output |
| X = (table(X, 1) != 0) |
| Y = (table(Y, 1) != 0) |
| n = min(nrow(X), nrow(Y)) |
| I = X[1:n,] * Y[1:n,] |
| |
| # reconstruct integer values and create output |
| R = removeEmpty(target=seq(1,n), margin="rows", select=I) |
| } |