[R] Writing a function, want a string argument to define the name of the excel sheet to be called

[AOLeary]

My question is this: is there a way I can make one of the arguments of the
function be a string the user can enter, and then have that be the excel
filename? ie,

foo <- function(x,y,NAME){

#make a matrix with x rows and y cols
M <- matrix(nrow=x,ncol=y)
#write the matrix
write.table(M, file = "result.csv",append=TRUE, sep = ",") 
}

I've had a look but I couldn't find help for this particular problem and
it's one I'd like to solve, so I can change make several excel files to
solve the analysis my actual function does.

Thank you very much,
Aodhán

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