Nothing
rowcol <-
function(I,J,elements){
elements[elements>(I*J)]=NA
whichcol=ceiling(elements/I)
whichrow=elements-(I*(whichcol-1))
#for (i in 1:length(elements)){print(x[whichrow[i],whichcol[i]])}
return(list(whichrow=whichrow,whichcol=whichcol))}
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