Re: log contour intervals

[Steve Hankin <hankin@xxxxxxxxxxxxx>]

Hi Mick and Alice,

I overlooked the FAQ about customizing the color bar. It has the same substance
as my previous message, but much more readable.

    http://ferret.wrc.noaa.gov/Ferret/FAQ/custom_plots/shakey.html

    - steve

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

SPILLANE@pmel.noaa.gov wrote:

> Hello Alice,
>         I don't see a simple solution to your color key labelling
> problem, unless contouring the (base-10) log of the function is
> acceptable.  The latter might make the setting of your non-integer
> exponents easier in a way.
>
>         I believe ferret doesn't have the newer plotplus commands
> that customise the colorbar (colorbar,cbaxis,cbfor,cblabp,cblint
> and cbcsze).  If you could turn off the key labels (cblabp) or
> render them with zero height (cbcsze) then you could use "ppl
> %label" or movable labels to put in any values you like. Perhaps
> you can still use this idea by plotting a white polygon to blot
> out the offending key labels
> polygon/i=1:4/pal=blue/nokey/nolab/over xx,yy
> where xx,yy set by ysequence are the coords of the white rectangle.
>
>         Another workaround would be to drop the key entirely and
> use overlay contours to put correctly labelled contour lines on
> the plot itself.  For your case if you want levels at 1.5x10^n
> where n=-10,-9,-8...-4 say then using a test function 1/10^(i+j+0.5)
> you would (leaving the color bar as a check here)
>
> fill/i=1:10/j=1:10/lev=(-9.824,-3.824,1) log(1/10^(i+j+0.5))
> ppl conpre,@sr1.5e
> contour/over/i=1:10/j=1:10/nolab/lev=(-9.824,-3.824,1,-1) log(1/10^(i+j+0.5))
>
> Note the extra "-1" in the contour lev instruction which forces
> integer contour labels.  This in combination with the "conpre"
> results in labels like 1.5e-10.
>
> Hope this is of some help.
> Mick
> -------------------------------------------------------------------------
> Mick Spillane                            _/_/_/_/ _/_/_/_/  _/_/   _/_/_/
> Phone : (206)526-6780                   _/         _/   _/  _/   _/    _/
> E-mail: spillane@pmel.noaa.gov         _/_/_/     _/_/_/   _/   _/
> U of W Box 357941                     _/         _/       _/   _/    _/
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--
Steve Hankin
NOAA/PMEL, 7600 Sand Point Way NE, Seattle, WA 98115-0070
ph. (206) 526-6080 -- FAX (206) 526-6744