| #------------------------------------------------------------- |
| # |
| # 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. |
| # |
| #------------------------------------------------------------- |
| |
| |
| A = rand(rows=3, cols=3) |
| B = rand(rows=3, cols=2) |
| C = rand(rows=10, cols=20) |
| D = rand(rows=20, cols=2) |
| E = rand(rows=10, cols=30) |
| |
| # ((A %*% B) %*% t(C %*% D)) %*% E -> optimal plan (3 x 2 + 2 x 10) + 10 x 30 -> 60 + 30*30 = 2100 |
| # (A %*% B) %*% (t(C %*% D) %*% E) -> or this?? 3 x 2 + (2 x 10 + 10 x 30) -> 20*30 + 3*2*30 = 1200 |
| |
| |
| R = A %*% B %*% t(C %*% D) %*% E |
| |
| write(R, $1) |
| |
