[Gretl-devel] about gnuplot's "errorbars" option

Hi, I've done some experiments to get (vertical) lines indicating pointwise confidence intervals into a plot with gnuplot. Basically I have one question and one feature request. First the question: it concerns some gnuplot code which works in pure gnuplot but not as a saved graph symbol in gretl's session view. Here's a concrete example: Start by running the following hansl snippet in gretl: <hansl> nulldata 10 setobs 1 1990 --time-series series y = 2 * normal() series width = uniform() test <- plot y options time-series with-lines options band=y,width band-style=fill,0x000000 end plot --output=display </hansl> Now in the produced plotting code (right-click the graph symbol and choose "edit plot commands") there's the following line: <gnuplot> '-' using 1:($2-1*$3):($2+1*$3) notitle lc rgb "#000000" w filledcurve, \ </gnuplot> If I copy the entire code into a new text file and load that in gnuplot it works alright. Then I change (two things in) the line above to obtain (notice the extra "($2)"!): <gnuplot> '-' using 1:($2):($2-1*$3):($2+1*$3) notitle lc rgb "#000000" w errorbars, \ </gnuplot> ... and loading the modified file in gnuplot produces what I want (attached). However, if I apply these exact modifications to the plotting commands saved in the session view icon of the graph and try to view the result, I get an "unspecified error". So the question is simply, why doesn't it work there? The associated feature request is to enable an errorbars option to the band-plotting apparatus. Basically adding a new band-style option "errorbars" which writes the gnuplot code that I have described above. Thanks, sven