Re: [ferret_users] using /limits and modulo longitude axis, ferret 6.7.2

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

Hi
/HLIM and /VLIM are different from other qualifiers, in that they make a 
setting that apply only to the plot axes that are drawn; they don't set 
the context of the variable that you're plotting.  To set the context, 
either use /X= /Y=  or put the region on the variable itself with square 
brackets, as in rose[x=-20:40,y=30:70].  SET REGION would also work, but 
it tends to overdo things, as you say; applying that context globally to 
all the variables.  A simple solution would be to start with this:

use etopo20
shade /x=-20:40 /hlim=-20:40 /vlim=30:70 /pal=green if (rose gt 0) then 1

Thanks for the note about "shade /hlim=20w:40e".  That does look like a bug.

Ansley

On 6/21/2012 12:06 AM, Hein Zelle wrote:
> Dear Ferret users,
>
> I'm sure this was discussed recently, but I can't find it
> immediately.  For some of our more complex weather charts, we start
> with drawing a land mask in light green, something like
>
> use etopo20
> shade /hlim=-20:40 /vlim=30:70 /pal=green if (rose gt 0) then 1
>
> As you can see when trying this with ferret 6.72, this only draws land
> east of 20E.  The etopo data set has it's longitude boundary at 20E.
> What am I doing wrong here?  It works fine with
>
> set region /x=-20:40 /y=30:70
> shade /pal=green if (rose gt 0) then 1
>
> Unfortunately in some cases I can't always use the region, because we're
> plotting complex transformed variables which use the x dimension for
> other purposes.  It also breaks when overlaying on top of a plot which
> used limits before.
>
>
> A second problem:
>
> shade /hlimits=-20:40        works fine,
> shade /hlimits=20w:40e       doesn't
>     (check the X axis labels! 20w, 60w, 100w, ... , 180, 140e, 100e, 60e)
>
>
> This last one appears to be a software bug, but perhaps I've missed
> something.
>
>
> Kind regards,
>       Hein