gusucode.com > demos工具箱matlab源码程序 > demos/covarianceMapper.m
function covarianceMapper(t,~,intermKVStore) %covarianceMapper Mapper function for mapreduce to compute covariance % Copyright 2014 The MathWorks, Inc. % Get data from input table and remove any rows with missing values x = t{:,:}; x = x(~any(isnan(x),2),:); % Compute and save the count, mean, and covariance n = size(x,1); m = mean(x,1); c = cov(x,1); % Store these as a single item in the intermediate key/value store add(intermKVStore,'key',{n m c}) end