| #------------------------------------------------------------- |
| # |
| # 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. |
| # |
| #------------------------------------------------------------- |
| |
| # input: 1) frame, 2) lamba expression to execute for each non-null cell |
| # output: frame of string columns |
| |
| # Examples: |
| # map(X, "x -> x.split(\"r\")[1]") |
| # map(X, "x -> x.charAt(2)") |
| # map(X, "y -> UtilFunctions.toMillis(y)") |
| |
| X = read($1, data_type = "frame", format = "csv", header = FALSE) |
| # column vector and string operation |
| Y = map(X, $2) |
| write(Y, $3, format="csv") |
| write(X, $4, format="csv") |
