scripts/utils/rowIndexMax.dml

#-------------------------------------------------------------
#
# 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.
#
#-------------------------------------------------------------

# Utility script to return for each row the column nbr with the largest value. If all the values in
# a row are the same, then the largest column nbr is returned.
#
# Parameters:
#    I       : (input)  filename of input
#    O       : (output) filename of output
#    ofmt    : default "csv"; format of O: "csv", "binary"
#
# Example:
#   hadoop jar SystemML.jar -f algorithms/utils/rowIndexMax.dml -nvargs I="/tmp/X.mtx" O="/tmp/X2.mtx"
#

ofmt = ifdef($ofmt, "csv")

M = read($I)
C = rowIndexMax(M)
write(C, $O, format=ofmt)