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Re: [ferret_users] Ribbon plot with levels messes up first missing value



Hi Hella,

I see this with older versions of Ferret, but starting with v6.94, it seems to be working correctly. Which version of Ferret are you using?

I would be interested to see an example of the problem you were having with polygon plots and missing data. If you use POLYGON/LINE/FILL then missing values of the color variable should be drawn as an unfilled outline.

By the way, the syntax you used to define variable "a" is fine, but a more convenient method for defining a constant-array variable with missing values would be:

   let a = { , , 10, 20, 30}

-Ansley

On 12/15/2016 10:18 AM, Hella Riede wrote:
Hello ferreters,


when executing the following commands in ferret, the second missing value in variable 'a' is plotted with the correct level color in all 3 plot commands. The first missing value is only plotted with the correct level color (undefined, for example gray) when no levels /lev=... are specified. If levels are specified, the first point is given a spurious value of somewhere between -0.3E34 and -0.29E34. Minimal working example:

let a = {-1E34, -1E34, 10, 20, 30}
let b = {1,2,3,4,5}

plot/rib/vs/sym=27/size=0.18/vlim=0:6/hlim=0:6  b,b,a
plot/rib/vs/sym=27/size=0.18/vlim=0:6/hlim=0:6/lev=(-inf)(0,40,10)(inf) b,b,a plot/rib/vs/sym=27/size=0.18/vlim=0:6/hlim=0:6/lev=(-inf)(-0.33E34,-0.28E34,0.1E33)(inf) b,b,a

Figures produced with the three plot commands are attached.

I hoped to use plot/ribbon command for my data as the polymark command cannot deal with undefined values either, at least not if they appear as a block at the beginning of the data used to color levels. In polymark, this shifts the time axis by several hours to incorrect times (more complicated case, don't have a minimal working example for this one at the moment).


Thanks in advance for directions.

Best wishes,
Hella



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