Lorenzo, This is a bit ugly but should work. Instead of using plotrix's show.values, use the text() command: for(i in 1:5) { for(j in 1:5) { text(i-0.5,j-0.5,format(A[6-j,i],digits=3),col="white") } } -- View this message in context: http://r.789695.n4.nabble.com/Plotrix-Trick-tp2265893p2266390.html Sent from the R help mailing list archive at Nabble.com.