Re: plot annotation

[Steve Hankin <hankin@xxxxxxxxxxxxx>]

Hi Denise,

This has become straightforward to do in Ferret V5.1. For now, this example
illustrates a solution in Ferret V5.  You'll see that you need to make sure
that your time axis is in units of hours and that you need to subtract off an
offset based on T0 and the output of PPL list taxis:

define axis/t=1-jan-1980:1-jan-1990:24/t0=1-jan-1900/unit=hours thr
let tt = T[gt=thr]
let my_var = SIN(tt/5000)
plot my_var
ppl list taxis   ! note the 8770
label `tt[t=1-jan-1980@ITP]-tt[t=1-jan-1980]+8770`,0.30,-1,0,.3 hello
label `tt[t=15-may-1984@ITP]-tt[t=1-jan-1980]+8770`,0.30,-1,0,.3 good bye
frame/file=label_on_T.gif

I hope this helps - steve

=====================================================

Denise Worthen wrote:

> I am trying to annotate a line plot that has time as the x-axis.
>
> I've been able to annotate line plots when the x-axis is either lat, lon
> so that I get something like the following legend in the upper right
> corner:
>
>  "line"     Spr
>  "square"   Sum
>  "triangle" Aut
>  "circle"   Win
>
> using
> plot/vs/sym=17 xval,yval (a square)
> label xval,yval,0,0,Sum
>
> where xval and yval are the positions to locate the label but I can't
> figure out how to indicate the xval position when the xaxis is time.  The
> only thing I've gotten to work is to cancel mode calendar, so that my
> T-axis is in hours. Then the above method works fine, but having a time
> axis that goes from 276263 to 284807 isn't really what I want.
>
> Can anyone provide an solution?
>
> Thanks,
> Denise.
> =====================================================================
> Denise L. Worthen, SSAI
> Oceans and Ice Branch/Code 971
> NASA Goddard Space Flight Center
> Greenbelt MD 20771
>
> dlw@weka.gsfc.nasa.gov
> (301) 286-2339

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