[ncl-talk] Removing 0,0 Coordinate Values from Scatterplot

[Dennis Shea]

[1] re: "Does the fill value need to be defined?"   ===> No.

[2] re: "since I'm redefining a variable ..."

Technically, you are not *redefining *the variable. Rather, you are
*reassigning* values.

[3] re: "does this require := rather than = ""

The *= *is an *assignment* operator. Since you are not changing the
variable type or size or shape*, *you do not need to use* the
reassignment *operator
*:=*

On Sun, Jun 30, 2019 at 7:33 PM Zach Rieck via ncl-talk <ncl-talk at ucar.edu>
wrote:

> Does the fill value need to be defined? And since I'm redefining a
> variable does this require := rather than =?
>
> Thanks again for the help!
>
> -Zach Rieck
> zrr817 at gmail.com
> (513)-502-5652
>
>
> On Fri, Jun 28, 2019 at 4:06 PM Adam Phillips <asphilli at ucar.edu> wrote:
>
>> Hi Zach,
>> Something like this should work:
>> ; output1 and output2 are 1D arrays of the same length
>> output1 = where(output1.eq.0.and.output2.eq.0,output1 at _FillValue,output1)
>>
>> That will set all points in output1 to _FillValue where both output1 and
>> output2 are 0. Those points will not get plotted.
>> (Note that this overwrites your output1 array, if you do not want that
>> you'll want to copy output1 to say output1_save before doing the above.)
>>
>> If you have further questions let ncl-talk know.
>> Adam
>>
>> On Fri, Jun 28, 2019 at 3:54 PM Zach Rieck via ncl-talk <
>> ncl-talk at ucar.edu> wrote:
>>
>>> To whom it May Concern-
>>>
>>> I had a general question about how to change a scatter plot I have
>>> created. The plot compares values from 2 model outputs relative to a 1:1
>>> line for SLW, and since it is for a dry location, it has several 0,0
>>> gridpoints (i.e. both models indicated no SLW was present).
>>>
>>> At the request of the leader of the project, I've been tasked with
>>> removing those points from the plot. I was thinking about trying to use an
>>> if then statement to try to reassign my plotting variables, but I'm unsure.
>>>
>>> Please advise. I framed this as a general question so I have not
>>> attached code or data, but if that would be helpful to solving this
>>> question please let me know.
>>>
>>> Respectfully,
>>>
>>> -Zach Rieck
>>> zrr817 at gmail.com
>>> (513)-502-5652
>>> _______________________________________________
>>> ncl-talk mailing list
>>> ncl-talk at ucar.edu
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>
>>
>> --
>> Adam Phillips
>> Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
>> www.cgd.ucar.edu/staff/asphilli/   303-497-1726
>>
>> <http://www.cgd.ucar.edu/staff/asphilli>
>>
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