Re: [ferret_users] Draw line in x-y-plot

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hi -
What you're trying will work, you just need need to give two lists, with the xpoints and ypoints, with a comma between, and just let them be simple values that express the locations in the units of the coordinates of the grid you're using (here, in degrees west, and degrees north.)

yes? set data levitus_climatology
yes? shade temp[k=1]

yes? plot/vs/line/over/color=black/nolabel  {110,10}, {10,40}

The plot as it's presented by default breaks at 20 west, so it might be better to locate it differently in X to begin with

yes? set data levitus_climatology
yes? shade/x=0:360 temp[k=1]

yes? plot/vs/line/over/color=black/nolabel  {110,10}, {10,40}

! and you can plot any number of locations this way, e.g.
yes? plot/vs/line/over/color=purple/nolabel {110,210,215}, {20,30,-30}

The plot as it's presented by default breaks at 20 west, so it might be better
and, while the ALINE command mentioned in the last message does work, but it doesn't work well on plots involving time. Just a couple of resources here for that,
http://ferret.pmel.noaa.gov/FERRET_17sep07/FAQ/custom_plots/time_series_symbol_overlay.html
http://ferret.pmel.noaa.gov/FERRET_17sep07/FAQ/custom_plots/time_series_overlay.html


Arne Biastoch wrote:

Hi Ferreters,

just a quick and (I assume) simple question that struggles me.

Suppose I have a x-y-plot, e.g.

yes? set data levitus_climatology
yes? shade temp[k=1]

How can I draw a single line, e.g. from 10N/110W to 40N/10W?
I tried:

yes? plot/vs/line/over/color=black/nolabel {110W,10N}{10W,40N}
 **ERROR: command syntax: {110W,10N}{10W,40N}
          {110W,10N} before {10W,40N} is illegal

but always get an error.

Thanks,
	Arne