Thank you all for your answers. I eventually use the points command
plot(MATRIX[,1]) points(MATRIX[,2]) points(MATRIX[,3]) ... with matplot I had numbers instead of points with type="p" and par(new=TRUE) makes complications with the axis. ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
