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Magrittr%>% Operator for resizing matrix

I am doing my childish steps with an operator %>%

in R. This is extremely useful, but sometimes I get stuck on what should be simple.

Consider the following example:

mm<-matrix(nrow=4, ncol=5, seq(20))
dim(mm)<-NULL

which I am using for matrix smoothing. How can you smooth mm with %>%

?

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4 answers


One solution would be c()

:



mm %>% c
#[1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20
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You can use the function:

set_dim_to_null <- function(mat) {
  dim(mat) <- NULL
  mat
}

mm %>% 
  set_dim_to_null()


Or use curly braces, which can act like an anonymous function:

mm %>% {
    dim(.) <- NULL
    .
  }
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mm %>% as.numeric

also gives the desired result.

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Magrittr has several aliases for settings.

dim

not among them, but setters in R are really just functions with special names that end in <-

and return modified objects. So simply doing the following gives you a nicely named function that does what you want:

set_dim <- `dim<-`

You can use an alias like this or a simple mesh name in pipes:

mm %>% set_dim(NULL)
mm %>% `dim<-`(NULL)
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