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As far as I can see, the gmp package does not currently support a raw
interface to create bigz values. Here is my workaround:
####
plaintext <- "Rossetta Code"
stringtoasciihex <- function( s ) {
vs <- strsplit( s, "", fixed = TRUE )[[ 1 ]]
asc <- sapply( vs, function( C ) as.character( charToRaw( C ) ) )
paste( c( "0x", asc ), collapse="" )
}
gmp::as.bigz( stringtoasciihex( plaintext ) )
###
On Sat, 17 Aug 2019, Martin M?ller Skarbiniks Pedersen wrote:
Hi,
I am trying to make a R version a RosettaCode task involving big number.
More precise, I am trying to convert the c-solution
http://rosettacode.org/wiki/RSA_code#C
to R.
These two lines in C gives me problems:
const char *plaintext = "Rossetta Code";
mpz_import(pt, strlen(plaintext), 1, 1, 0, 0, plaintext);
I have tried:
library(gmp)
plaintext <- "Rossetta Code"
as.bigz(charToRaw(plaintext))
and
library(gmp)
plaintext <- "Rossetta Code
as.big(split(plaintext,""))
Thanks for any help/suggestions
Regards
Martin M. S. Pedersen
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