| #------------------------------------------------------------- |
| # |
| # 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. |
| # |
| #------------------------------------------------------------- |
| |
| |
| cov = function(matrix[double] X) |
| return(matrix[double] out) { |
| |
| K = -2 * X %*% t(X) + rowSums(X^2) + t( rowSums(X^2) ) |
| out = exp(- 0.5 * K); |
| |
| } |
| |
| /* |
| # for each dimension |
| for( di in 1:d) { |
| |
| Xd = X[1:n,di] %*% matrix(1, rows=1, cols=n); |
| |
| diff = Xd - t(Xd) |
| |
| } |
| */ |
