Using R, I am looking to create a QR code and embed it into an Excel spreadsheet (hundreds of codes and spreadsheets). The obvious way seems to be to create a QR code using the command line, and use the "system" command in R. Does anyone know how to pass R variables through the "system" command? Google is not too helpful as "system" is a bit generic, ?system does not contain any examples of this.

Note - I am actually using data matrices rather than QR codes, but using the term "data matrix" in an R question will lead to havoc, so let's talk QR codes instead. :-)

system("dmtxwrite my_r_variable -o image.png")

fails, as do the variants I have tried with "paste". Any suggestions gratefully received.

r shell variables cran
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