What does function mean in R

Question

I have seen the use of   gt    percent greater than percent  function in some packages like dplyr and rvest   What does it mean  Is it a way to write closure blocks in R

User · Answer

gt   is similar to pipe in Unix  For example  in  a  lt - combined data set   gt   group by Outlet Identifier    gt   tally     the output of combined data set will go into group by and its output will go into tally  then the final output is assigned to a   This gives you handy and easy way to use functions in series without creating variables and storing intermediate values

User · Answer

operators   gt   has no builtin meaning but the user  or a package  is free to define operators of the form  whatever  in any way they like   For example  this function will return a string consisting of its left argument followed by a comma and space and then it s right argument   quot     quot   lt - function x  y  paste0 x   quot    quot   y     test run   quot Hello quot       quot World quot      1   quot Hello  World quot   The base of R provides      matrix mulitiplication         integer division    in   is lhs a component of the rhs     o   outer product  and  x   kronecker product    It is not clear whether    falls in this category or not but it represents modulo  expm  The R package  expm  defines a matrix power operator       For an example see Matrix power in R   operators The operators R package has defined a large number of such operators such as   in   for not  in    See http   cran r-project org web packages operators operators pdf igraph This package defines  --     - gt   and   lt -  to select edges  lubridate  This package defines  m   and  m-  to add and subtract months and  --  to define an interval   igraph also defines  --    Pipes magrittr In the case of   gt   the magrittr R package has defined it as discussed in the magrittr vignette   See http   cran r-project org web packages magrittr vignettes magrittr html magittr has also defined a number of other such operators too   See the Additional Pipe Operators section of the prior link which discusses  T gt      lt  gt   and     and http   cran r-project org web packages magrittr magrittr pdf for even more details  dplyr The dplyr R package used to define a     operator which is similar  however  it has been deprecated and dplyr now recommends that users use   gt   which dplyr imports from magrittr and makes  available to the dplyr user   As David Arenburg has mentioned in the comments this SO question discusses the differences between it and magrittr s   gt     Differences between      dplyr  and   gt    magrittr  pipeR The R package  pipeR  defines a   gt  gt   operator that is similar to magrittr s   gt   and can be used as an alternative to it   See http   renkun me pipeR-tutorial  The pipeR package also has defined a number of other such operators too   See  http   cran r-project org web packages pipeR pipeR pdf postlogic The postlogic package defined  if  and  unless  operators  wrapr The R package  wrapr  defines a dot pipe    gt   that is an explicit version of   gt   in that it does not do implicit insertion of arguments but only substitutes explicit uses of dot on the right hand side   This can be considered as another alternative to   gt    See https   winvector github io wrapr articles dot pipe html Bizarro pipe   This is not really a pipe but rather some clever base syntax to work in a way similar to pipes without actually using pipes   It is discussed in http   www win-vector com blog 2017 01 using-the-bizarro-pipe-to-debug-magrittr-pipelines-in-r    The idea is that instead of writing  1 8   gt   sum   gt   sqrt     1  6  one writes the following   In this case we explicitly use dot rather than eliding the dot argument and end each component of the pipeline with an assignment to the variable whose name is dot        We follow that with a semicolon  1 8 - gt    sum    - gt    sqrt        1  6  Update Added info on expm package and simplified example at top   Added postlogic package

User · Answer

The R packages dplyr and sf import the operator     from the R package magrittr    Help is available by using the following command       gt      Of course the package must be loaded before by using e g   library sf    The documentation of the magrittr forward-pipe operator gives a good example  When functions require only one argument  x     f is equivalent to f x

User · Answer

My understanding after reading the link offered by G Grothendieck is that     is an operator that pipes functions  This helps readability and productivity as it s easier to follow the flow of multiple functions through these pipes than going backwards when multiple function are nested

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