Error could not find function

Question

I m running an example in R  going through the steps and everything is working so far except for this code produces an error      words  lt - dtm   gt    as matrix   gt    colnames   gt     function x  x nchar x   lt  20        Error  could not find function         I don t understand what the benefit of using this special operator   gt   is  and any feedback would be great

User · Answer

On Windows  if you use     inside a  dopar  loop  you have to add a reference to load package dplyr  or magrittr  which dplyr loads    Example   plots  lt - foreach myInput iterators  iter plotCount    packages c  RODBC    dplyr     dopar        return getPlot myInput       If you omit the  packages command  and use  do  instead to make it all run in a single process  then works fine  The reason is that it all runs in one process  so it doesn t need to specifically load new packages

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The benefit is that the output of previous function is used  You do not need to repeat where the data source comes from  for example

User · Answer

One needs to install magrittr as follows install packages  quot magrittr quot    Then  in one s script  don t forget to add on top library magrittr   For the meaning of the operator   gt   you might want to consider this question  What does   gt   function mean in R  Note that the same operator would also work with the library dplyr  as it imports from magrittr  dplyr used to have a similar operator        which is now deprecated  Here we can read about the differences between      deprecated operator from the library dplyr  and   gt    operator from magrittr  that is also available in dplyr

User · Answer

the following can be used    install packages  data table    library data table

User · Answer

You need to load a package  like magrittr or dplyr  that defines the function first  then it should work   install packages  magrittr     package installations are only needed the first time you use it install packages  dplyr        alternative installation of the   gt   library magrittr    needs to be run every time you start R and want to use   gt   library dplyr       alternatively  this also loads   gt     The pipe operator   gt   was introduced to  decrease development time and to improve readability and maintainability of code    But everybody has to decide for himself if it really fits his workflow and makes things easier  For more information on  magrittr  click here   Not using the pipe   gt    this code would return the same as your code   words  lt - colnames as matrix dtm   words  lt - words nchar words   lt  20  words     EDIT   I am extending my answer due to a very useful comment that was made by  Molx      Despite being from magrittr  the pipe operator is more commonly used   with the package dplyr  which requires and loads magrittr   so   whenever you see someone using   gt   make sure you shouldn t load dplyr   instead

[r] Error: could not find function "%>%"

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