for-loop

问题 I am on Mac OS 10.10 with R 3.1.1 Suppose I have the following data frames a and b with the same attributes: a<- structure(list(X1 = 1:5, X2 = 6:10), .Names = c("X1", "X2"), row.names = c(NA, -5L), class = "data.frame") b<- structure(list(X1 = 11:15, X2 = 16:20), .Names = c("X1", "X2" ), row.names = c(NA, -5L), class = "data.frame") and suppose I need to do some cleaning/apply some functions (like dropping column and multiply the first column by 2) on both a and b at the same time such that

问题 I am on Mac OS 10.10 with R 3.1.1 Suppose I have the following data frames a and b with the same attributes: a<- structure(list(X1 = 1:5, X2 = 6:10), .Names = c("X1", "X2"), row.names = c(NA, -5L), class = "data.frame") b<- structure(list(X1 = 11:15, X2 = 16:20), .Names = c("X1", "X2" ), row.names = c(NA, -5L), class = "data.frame") and suppose I need to do some cleaning/apply some functions (like dropping column and multiply the first column by 2) on both a and b at the same time such that

问题 I am on Mac OS 10.10 with R 3.1.1 Suppose I have the following data frames a and b with the same attributes: a<- structure(list(X1 = 1:5, X2 = 6:10), .Names = c("X1", "X2"), row.names = c(NA, -5L), class = "data.frame") b<- structure(list(X1 = 11:15, X2 = 16:20), .Names = c("X1", "X2" ), row.names = c(NA, -5L), class = "data.frame") and suppose I need to do some cleaning/apply some functions (like dropping column and multiply the first column by 2) on both a and b at the same time such that

来源： https://stackoverflow.com/questions/64672235/how-do-i-use-scanf-within-a-loop-to-read-a-string

来源： https://stackoverflow.com/questions/64612728/multiple-commands-within-a-for-loop-multiple-for-loops-or-something-else

来源： https://stackoverflow.com/questions/64612728/multiple-commands-within-a-for-loop-multiple-for-loops-or-something-else

来源： https://stackoverflow.com/questions/64612728/multiple-commands-within-a-for-loop-multiple-for-loops-or-something-else

来源： https://stackoverflow.com/questions/64587440/implementing-lists-in-a-for-loop-in-r-to-produce-a-table-of-column-names-and-dat

来源： https://stackoverflow.com/questions/38465855/nested-for-with-variables

来源： https://stackoverflow.com/questions/33421834/error-incompatible-types-object-could-not-be-converted-arraylist