Dear gretl users, I know that this is actually a gnuplot-issue but I thought that some of may also be interested in it and I somebody else could help me with this. I would like to generate a clustered histogram in the same vein as the 2nd one here: http://gnuplot.sourceforge.net/demo_svg_5.0/histograms.html using gnuplot version 5. However, my example function below doesn't produce the graph I need, as only the first column (first bar) is plotted but not the 2nd one. I already spent a while on this but couldn't find the error. <hansl> clear set echo off set messages off set seed 1234 function void plotty (matrix mat, string fname) string path = "barclust.gp" sprintf tmpfile "@dotdir/@path" outfile @tmpfile --write printf "set encoding utf8 \n" printf "set auto x \n" printf "set style data histogram \n" printf "set style histogram cluster gap 1 \n" printf "set style fill solid border -1 \n" printf "set boxwidth 0.9 \n" printf "plot '-' using 2:xtic(1), '' using 3\n" loop i=1..rows(mat) -q loop j=1..cols(mat) -q if mat[i,j]<0 || mat[i,j]>=0 printf "%.6f", mat[i,j] else printf "NaN" endif if j<cols(mat) printf " " endif endloop printf "\n" endloop printf "e \n" outfile --close gnuplot --input="@tmpfile" --output="@fname" end function matrix mat = seq(1,5)'~mnormal(5,2) string fname = &quot;(a)dotdir/check.pdf&quot; plotty(mat, fname) </hansl> Best, Artur