操作与rowwise
很慢,所以过滤掉SmplMode(y), mean(y), diff(range(y))
早期条件在逐行操作的帮助下matrixStats
包很好地加快了速度。以下在我的笔记本电脑上运行大约 0.4 秒,而您的原始解决方案和 @shadow 的解决方案运行大约 70 秒。
library(dplyr)
library(matrixStats)
df <- data.frame(dt)
df$m <- rowMaxs(dt) #for SmplMode(y)
S <- matrix(1:6, ncol=ncol(dt), nrow=nrow(dt), byrow=T)
Z <- S*(dt!=0)
Z[Z==0] <- NA
df$Range <- rowMaxs(Z, na.rm=TRUE)-rowMins(Z, na.rm=TRUE) #for diff(rang(y))
df$Mean <- rowSums(S*dt)/rowSums(dt) #for mean(y)
res <- df %>%
filter(X4 == m, (X1==m)+(X2==m)+(X3==m)+(X4==m)+(X5==m)+(X6==m)==1,
Range == 4, # range condition here
Mean == 3) %>% #mean condition here
rowwise() %>%
mutate(Med = median(rep(c(1,2,3,4,5,6), c(X1, X2, X3, X4, X5, X6)))) %>%
filter(Med == 3.5) %>% #median condition here
select(-m, -Range, -Mean, -Med) %>% # get rid of newcols
as.matrix