Nothing
prep <-
function(dat){dat=as.data.frame(dat); rownb=dim(dat)[1]; colnb=dim(dat)[2];
for (j in 1:colnb) if (is.numeric(dat[,j])==FALSE) dat[,j]=as.numeric(as.character(dat[,j]));
for (i in 1:rownb) for (j in 1:colnb) if (is.na(dat[i,j])==TRUE) dat[i,j]=0;
return(dat);}
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