Being new to R, can someone please explain the difference between paste()
and paste0()
, what I had understood from some post is that
paste0("a", "b") === paste("a", "b", sep="")
Even I tried something like this
a <- c("a","b","c") b <- c("y","w","q") paste(a,b,sep = "_") **output** "a_y" "b_w" "c_q"
paste0()
a <- c("a","b","c") b <- c("y","w","q") paste0(a,b,sep = "_") **output** "ay_" "bw_" "cq_"
Is it just that paste()
uses separator between elements and paste0()
uses separator after the elements?
You can use the paste() and paste0() functions in R to concatenate elements of a vector into a single string. The paste() function concatenates strings using a space as the default separator. The paste0() function concatenates strings using no space as the default separator.
In R, the paste0() function is used to concatenate vectors after converting to character vectors.
paste0() function in R Language is used to concatenate all elements without separator. Syntax: paste0(…, collapse = NULL) Parameters: …: one or more R objects, to be converted to character vectors. collapse: an optional character string to separate the results.
paste() method in R programming is used to concatenate the two string values by separating with delimiters.
As explained in this blog by Tyler Rinker:
paste
has 3 arguments.
paste (..., sep = " ", collapse = NULL)
The...
is the stuff you want to paste together and sep and collapse are the guys to get it done. There are three basic things I paste together:
- A bunch of individual character strings.
- 2 or more strings pasted element for element.
- One string smushed together.
Here's an example of each, though not with the correct arguments
paste("A", 1, "%")
#A bunch of individual character strings.
paste(1:4, letters[1:4])
#2 or more strings pasted element for element.
paste(1:10)
#One string smushed together. Here's the sep/collapse rule for each:
- A bunch of individual character strings – You want sep
- 2 or more strings pasted element for element. – You want sep
- One string smushed together.- Smushin requires collapse
paste0
is short for:paste(x, sep="")
So it allows us to be lazier and more efficient.
paste0("a", "b") == paste("a", "b", sep="") ## [1] TRUE
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