[Gretl-users] plots with "bands"

This is somewhat relevant to http://lists.wfu.edu/pipermail/gretl-users/2016-May/011845.html but may be of interest in its own right. In git and snapshots there's a new option, --band, for the commands "gnuplot" and "plot". Right now it's very basic (and not yet documented); it could be fancied up in future by adding a parameter to inflect the option's effects. Anyway, here's how it works now. If you have a plot with 3 or more "lines", the --band option tells gretl to interpret lines 2 and 3 as upper and lower limits (or vice versa) of a band of some sort (e.g. a confidence interval). This means that 1) The two band limits will be shown in the same color. 2) The "key" or legend will be suppressed. 3) Gretl will not add a second y-axis, regardless of the scale of the data (i.e. the option --single-yaxis is implicit). To see what this does in practice you can compare these two plots: <hansl> nulldata 50 set seed 12345 setobs 1 1 --special-time series y = normal() series upper = y + 2 series lower = y - 2 list L = y upper lower gnuplot L --time-series --with-lines --output=display gnuplot L --time-series --with-lines --output=display --band </hansl> Yes, it would be nice if you could also set the style of the band (e.g. make it a shaded area rather than two lines). That may come, but it's a lot more complicated. Allin