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 "@dotdir\\irf%d.gp", tmpfname

else

    sprintf tmpfile "@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