Here is the IRFplot function I wrote it works badly when pdf is replaced by png, but gives this error when the pdf terminal is used: Couldn't recognize the image file format for file 'C:\Users\w3071048\AppData\Roaming\gretl\gretltmp.png' function void IRFplot(matrix response, string graph_title, string output_file) ## Plot IRF's #Make temporary file name. This file stores GNUPLOT script scalar tmpfname = int(1000*muniform(1,1)) h = rows(response) if $windows sprintf tmpfile "(a)dotdir\\irf%d.gp", tmpfname else sprintf tmpfile "(a)dotdir/irf%d.gp", tmpfname endif outfile "@tmpfile" --write printf "set term pdf font \"Sans,5\" size 275,200\n" printf "set encoding utf8\n" printf "set style line 1 lc rgb \"#ff0000\"\n" printf "set style line 2 lc rgb \"#0000ff\"\n" printf "set style line 3 lc rgb \"#00cc00\"\n" printf "set style line 4 lc rgb \"#bf25b2\"\n" printf "set style line 5 lc rgb \"#8faab3\"\n" printf "set style line 6 lc rgb \"#ffa500\"\n" printf "set style line 8 lc rgb \"#dddddd\"\n" printf "set style increment user\n" printf "set key left top\n" printf "set xlabel 'periods'\n" printf "set xzeroaxis\n" printf "set title '@graph_title'\n" printf "plot '-' using 1:2:3 notitle w filledcurve lt 8, 0 notitle w lines lt 0, '-' using 1:2 notitle w lines lt 1\n" loop for i=1..h -q printf "%d\t%g\t%g\n", i, response[i,2], response[i,3] endloop printf "e\n" loop for i=1..h -q printf "%d\t%g\n", i, response[i,1] endloop printf "e\n" outfile "@tmpfile" --close gnuplot --input="@tmpfile" --output=display gnuplot --input="@tmpfile" --output="@output_file" end function