www.gusucode.com > demos工具箱matlab源码程序 > demos/tsqrMapper.m
function tsqrMapper(data, info, intermKVStore) % Mapper function for the TSQRMapReduceExample. % Copyright 2014 The MathWorks, Inc. x = data{:,:}; x(any(isnan(x),2),:) = [];% Remove missing values [~, r] = qr(x,0); % intermKey = randi(4); % random integer key for partitioning intermediate results intermKey = computeKey(info, 8); add(intermKVStore,intermKey, r); function key = computeKey(info, numPartitions) % Helper function to generate a key for the tsqrMapper function. fileSize = info.FileSize; % total size of the underlying data file partitionSize = fileSize/numPartitions; % size in bytes of each partition offset = info.Offset; % offset in bytes of the current read key = ceil(offset/partitionSize);