magrittr

When using map on a nested data_frame, I do not understand why the latter two version give an error, how should I use the dot ( . )? library(tidyverse) # dummy data df <- tibble(id = rep(1:10, each = 10), val = runif(100)) df <- nest(df, -id) # works as expected map(df$data, min) df %>% .$data %>% map(., min) # gives an error df %>% map(.$data, min) # Error: Don't know how to index with object of type list at level 1 df %>% map(data, min) The problem isn't map , but rather how the %>% pipe deals with the . . Consider the following examples (remember that / is a two argument function in R):

Is it possible to filter a data.frame for complete cases using dplyr? complete.cases with a list of all variables works, of course. But that is a) verbose when there are a lot of variables and b) impossible when the variable names are not known (e.g. in a function that processes any data.frame). library(dplyr) df = data.frame( x1 = c(1,2,3,NA), x2 = c(1,2,NA,5) ) df %.% filter(complete.cases(x1,x2)) Try this: df %>% na.omit or this: df %>% filter(complete.cases(.)) or this: library(tidyr) df %>% drop_na If you want to filter based on one variable's missingness, use a conditional: df %>% filter

When using the pipe operator %>% with packages such as dplyr , ggvis , dycharts , etc, how do I do a step conditionally? For example; step_1 %>% step_2 %>% if(condition) step_3 These approaches don't seem to work: step_1 %>% step_2 if(condition) %>% step_3 step_1 %>% step_2 %>% if(condition) step_3 There is a long way: if(condition) { step_1 %>% step_2 }else{ step_1 %>% step_2 %>% step_3 } Is there a better way without all the redundancy? Here is a quick example that takes advantage of the . and ifelse : X<-1 Y<-T X %>% add(1) %>% { ifelse(Y ,add(.,1), . ) } In the ifelse , if Y is TRUE if

I would like to use the pipe-operator %>% introduced in the magrittr package in a package I wrote myself to chain dplyr data transformations. magrittr is listed as Import in the DESCRIPTION file. After loading my own package and testing the function which uses the pipe-operator I get the following error message: Error in functionname(parameter, : could not find function "%>%" Changing %>% to magrittr::%>% in the function source code does not help either because the package cannot be built anymore. tonytonov It should have worked correctly if you had magrittr listed in Depends . However, this