CODEWITHSUNDEEP
rmagrittr
RDJ
RDJ

Reputation: 4122

R Code Error - How To Rewrite Code Using Magrittr

I cannot rewrite a piece of standard R code using magrittr

This works fine as standard R: 

q1 <- tbl_df(read.csv('activity.csv',
                  header = TRUE,
                  sep = ',',
                  colClasses = c('numeric', 'POSIXct', 'numeric')))

But this does not using magrittr:

q1 <- 
    tbl_df(read.csv('activity.csv')) %>%
    header = TRUE %>%
    sep = ',' %>%
    colClasses = c('numeric', 'POSIXct', 'numeric')


Error in "," %>% colClasses = c("numeric", "POSIXct", "numeric") :
target of assignment expands to non-language object

I kind of understand the gist of the error, but don't know what to do about it.

Upvotes: 1

Views: 110

Answers (1)

lukeA
lukeA

Reputation: 54237

%>% is used to chain multiple operations, not to specify parameters (see ?'%>%'). So stick to the first one. :-) Or use 

read.csv('activity.csv', 
         header = TRUE, 
         sep = ',', 
         colClasses = c('numeric', 'POSIXct', 'numeric')) %>% 
  tbl_df()

Upvotes: 4

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