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lowerchars
2017 Jun 27
0
paste strings in C
...this in C, it would probably be easier and faster to just do the
string manipulation directly. Luckily, there are already packages that
have done this for you. See an example below using the S4Vectors
package.
foo2 <- function(mymat, colnms, tilde=FALSE) {
chars <- colnms[col(mymat)]
lowerChars <- if (tilde) paste0("~", chars) else tolower(chars)
chars <- ifelse(mymat==1L, lowerChars, chars)
keep <- mymat > 0L
charList <- split(chars[keep], row(chars)[keep])
S4Vectors::unstrsplit(charList, "*")
}
Or perhaps more efficient using the comp...
2017 Jun 27
2
paste strings in C
Dear R-devs,
Below is a small example of what I am trying to achieve, that is trivial in
R and I would like to learn how to do in C, for very large matrices:
> (mymat <- matrix(c(1,0,0,2,2,1), nrow = 2))
[,1] [,2] [,3]
[1,] 1 0 2
[2,] 0 2 1
And I would like to produce:
[1] "a*C" "B*c"
Which can be trivially done in R via something like:
foo