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Re: [ferret_users] Solid contours for negative values? Thin zerocontours?



Hi Ryo -

You can specify everything about the contours, using extra qualifiers on contour/lev

contour/lev=(-20,20,5,-1) var_name ! standard dashed negative, thick zero, solid positive lines

! to get solid negative and dashed positive contours, with a thin zero line:
contour/lev=(-20,20,5,-1)line=(-20,0,5)dash(5,20,5) var_name

Note no comma between the various specifications of the contour lines, and there are only 3 arguments to the extra qualifiers line and dash (a third qualifier is "heavy"). You can list as many sets of contour levels and qualifiers as you want:

contour/lev=(-20,-12,2,-1)(-11,6,1,-1)(7.5,20,1.5,1)dark (10.5,16.5,1.5)dash(3,5,1)line(-4,-2,1) var_name

See further info in the manual, under "contour/LEVELS, examples"

Billy K

On Dec 15, 2005, at 3:30 AM, Ryo Furue wrote:

Hi Ferret users,

I guess I'm missing something, but could somebody tell me
how to control the "dash-ness" and thickness of contours?

In particular,
1) How to draw solid contours for negative values?
2) How to draw thin contours for the value zero?

I've found that setting the spacln parameter of CONSET
to zero achieves (1):

   yes? contour/set . . .
   yes? ppl conset ,,,,,0  !!<-- spacln = 0
   yes? ppl contour

But is this an "official" answer?

(2) is very sensitive to how you set contour levels.
For example, "lev=1CD" gives thick zero contours,
whereas "lev=(-5,5,1,-1)" sometimes gives thin ones
and sometimes thick ones, which seems to depend on history.
In addition, I've discovered an undocumented keyword BLAH

       . . . /lev=(-10,10,1,-1)BLAH(-10,10,1)

which always gives thin zero contours :-)
(This is true, but don't believe that it's a keyword.)

I'm using FERRET v5.81, Linux(g77) 2.4.21-32 - 07/13/05.

Thank you,
Ryo







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