What is the best way of using a character vector, such as:

vector <- c("36","944","38","994")

To generate a string like this:

new_string  <- "x  == '36'| x  == '944'| x  == '38'| x  == '994'"

I tried using paste0 but I am searching for a more efficient way to do this, i.e.

paste0("x  == ", '36', "| x  == ", "944, "| x  == ")  

CodePudding user response：

We may use %in% here instead of == (assuming that the end goal is to subset a vector x based on the values in vector

 x %in% vector

If we want to use ==, this can be done with Reduce

Reduce(`|`, lapply(vector, function(u) x == u))

If the intention is to create a string, use collapse in paste

paste0('x==', "'", vector, "'", collapse = "|")
[1] "x=='36'|x=='944'|x=='38'|x=='994'"

CodePudding user response：

paste0 is actually efficient, as R is a vectorized language. Try this:

vector <- c("36","944","38","994")

paste0("x == '", vector, "'",collapse = "|")

Hope it is helpful.