dplyr filter arrange 行列 内積

 

dplyr::filter(js,prefecture==35) %>% dplyr::group_by(.,date) %>% dplyr::summarise(.,sum(count)) %>% last(.,20)

w <- ((dplyr::arrange(df.melt,t))[,3] %>% matrix(.,nrow=8) %>% t())%*% matrix(c(0, 0, 0, 0.001, 0.003, 0.014, 0.048, 0.125 ),ncol=1) 

dplyr::group_by(js,date,prefecture) %>% dplyr::summarise(.,sum(count))

# key を複数取るとことができる。primary key , sub key の順番？