[ncl-talk] Disappearing Dots (Correction)

Barry Lynn barry.h.lynn at gmail.com
Tue Jan 14 20:45:41 MST 2020 

Hi:

For reference, we are speaking about the following program, which draws an
arrowhead and line.

function arrow(wks,plt,xpts,ypts,res)

; draws an arrow on a plot. calling syntax is same as in gsn_add_polyline()

; Arindam Chakraborty <arch at caos.iisc.ernet.in>, May'10.


Sorry about the last two emails.  I had edited the wrong file (too late at
night).

As I originally wrote, both of your suggestions fixed the problem, and the
test program was much appreciated.

The key was changing all variables related to the polyline, the one calling
the arrow program, and the ones within the arrow program itself.

One thing: it is suggested to add two lines that control the thickness of
the arrow, which I have done (attached: to create a very thick arrow!).

Barry

On Wed, Jan 15, 2020 at 5:26 AM Barry Lynn <barry.h.lynn at gmail.com> wrote:

> It does, after all, simply return "plt," which I thought would be the one
> to store in an array (arr(i)), from the call itself, not the function
> within.  That's why I am a bit confused.
>
> On Wed, Jan 15, 2020 at 5:25 AM Barry Lynn <barry.h.lynn at gmail.com> wrote:
>
>> Rashed's fix worked fine.  I wonder why I am able to call the arrow
>> routine with a single array name (not array(i)).
>>
>> Thanks again.
>>
>> On Tue, Jan 14, 2020 at 9:48 PM Barry Lynn <barry.h.lynn at gmail.com>
>> wrote:
>>
>>> Rashed seems to demonstrate that his version works, so I will probably
>>> find the same.  I'll update later.
>>>
>>> Thank you for the help.
>>>
>>> Barry
>>>
>>> On Tue, Jan 14, 2020 at 9:47 PM Barry Lynn <barry.h.lynn at gmail.com>
>>> wrote:
>>>
>>>> Hi Adam, Rasheed.
>>>>
>>>> In both cases, I call the function within a loop.  The only difference
>>>> is whether I refer to array(i) or arr_0, arr_1... n.
>>>>
>>>> In any case, I will try Rashed's version.
>>>>
>>>> Barry
>>>>
>>>> On Tue, Jan 14, 2020 at 9:06 PM Adam Phillips <asphilli at ucar.edu>
>>>> wrote:
>>>>
>>>>> Hi Barry,
>>>>> If I had to guess, it is that the arrow function writes the
>>>>> gsn_add_polyline output as attributes named arr,arr1, and arr2 to the plt
>>>>> array that is to be returned by the function. If you call the function
>>>>> multiple times and pass all the graphical output to the same logical array
>>>>> named "array", each time you call arrow, array at arr, array at arr1 and
>>>>> array at arr2 will get overwritten.  To get around this, you should
>>>>> alter the arrow function to use the unique_string function.
>>>>>
>>>>> https://www.ncl.ucar.edu/Document/Functions/Built-in/unique_string.shtml
>>>>>
>>>>> For an example of how to do this, see polymarker example #18:
>>>>> https://www.ncl.ucar.edu/Applications/polyg.shtml#ex18
>>>>>
>>>>> For example, change this:
>>>>> plt at arr = gsn_add_polyline(wks,plt,xpts,ypts,res)
>>>>> to this:
>>>>> str = unique_string("arr")
>>>>> plt@$str$ = gsn_add_polyline(wks,plt,xpts,ypts,res)
>>>>>
>>>>> and do the same for the other two calls to gsn_add_polyline.
>>>>> Hope that helps!
>>>>> Adam
>>>>>
>>>>>
>>>>> On Tue, Jan 14, 2020 at 9:45 AM Barry Lynn via ncl-talk <
>>>>> ncl-talk at ucar.edu> wrote:
>>>>>
>>>>>> Hi:
>>>>>>
>>>>>> I have a bit of a mystery:
>>>>>>
>>>>>> I have a loop where I am calling gsn_add_polymarker. I created an
>>>>>> array (dum_b(n_calls)) so I could plot the markers within the loop.
>>>>>>
>>>>>> dum_b(i) = gsn_add_polymarker(wks,plot,lon_old(i),lat_old(i),mkres)
>>>>>>
>>>>>>
>>>>>> However, when I call:
>>>>>>
>>>>>>
>>>>>> array(i) = arrow(wks,plot,xpts,ypts,mkres)
>>>>>>
>>>>>>
>>>>>> I am not able to make the lines with the arrows (more than once).
>>>>>>
>>>>>>
>>>>>> warning:TransformPostDraw: tfPolyDrawList element 1 is invalid
>>>>>>
>>>>>>
>>>>>> Yet, if I call the same with
>>>>>>
>>>>>>
>>>>>> arr_0 = arrow...
>>>>>>
>>>>>>
>>>>>> arr_1 = arrow...
>>>>>>
>>>>>>
>>>>>> up to n_calls, I have no problem.
>>>>>>
>>>>>>
>>>>>> If someone can solve the mystery, I would be curious to find out the
>>>>>> reason for this "strange" behavior.
>>>>>>
>>>>>>
>>>>>> https://www.ncl.ucar.edu/Support/talk_archives/2010/att-1344/arrow.ncl
>>>>>>
>>>>>> On Mon, Jul 8, 2019 at 12:13 PM Barry Lynn <barry.h.lynn at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> Hi:
>>>>>>>
>>>>>>> That was absolutely the correct solution -- thank you.
>>>>>>>
>>>>>>> Are you aware of a way to increase the spacing between maps?  I am
>>>>>>> using wrf resources so this is very obtuse.
>>>>>>>
>>>>>>> Barry
>>>>>>>
>>>>>>> On Mon, Jul 8, 2019 at 10:44 AM Rashed Mahmood <
>>>>>>> rashidcomsis at gmail.com> wrote:
>>>>>>>
>>>>>>>> Hi Barry,
>>>>>>>> A quick look suggests that it may be related to not specifying
>>>>>>>> unique ids for markid and textid:
>>>>>>>>     markid = gsn_add_polymarker(wks,plots(0),lon,lat,mkres)
>>>>>>>>     textid = gsn_add_text(wks,plots(0),cities,lon,lat,txres)
>>>>>>>>
>>>>>>>> Next lines should have,
>>>>>>>> markid*1 *= gsn_add_polymarker(wks,plots(0),lon,lat,mkres)
>>>>>>>> textid*1* = gsn_add_text(wks,plots(0),cities,lon,lat,txres)
>>>>>>>>
>>>>>>>> and so on...
>>>>>>>>
>>>>>>>> Cheers
>>>>>>>>
>>>>>>>> Rashed
>>>>>>>>
>>>>>>>>
>>>>>>>> On Mon, Jul 8, 2019 at 7:51 AM Barry Lynn via ncl-talk <
>>>>>>>> ncl-talk at ucar.edu> wrote:
>>>>>>>>
>>>>>>>>> Hello:
>>>>>>>>>
>>>>>>>>> For some reason, the markid only appears on the last graph, but
>>>>>>>>> not the first two.  Yet, the "call" to each is the same.  I had this
>>>>>>>>> problem in other programs I wrote.
>>>>>>>>>
>>>>>>>>> If you have a suggestion, thank you,
>>>>>>>>>
>>>>>>>>> Barry
>>>>>>>>> --
>>>>>>>>> Barry H. Lynn, Ph.D
>>>>>>>>> Senior Associate Scientist, Lecturer,
>>>>>>>>> The Institute of the Earth Science,
>>>>>>>>> The Hebrew University of Jerusalem,
>>>>>>>>> Givat Ram, Jerusalem 91904, Israel
>>>>>>>>> Tel: 972 547 231 170
>>>>>>>>> Fax: (972)-25662581
>>>>>>>>>
>>>>>>>>> C.E.O, Weather It Is, LTD
>>>>>>>>> Weather and Climate Focus
>>>>>>>>> http://weather-it-is.com
>>>>>>>>> Jerusalem, Israel
>>>>>>>>> Local: 02 930 9525
>>>>>>>>> Cell: 054 7 231 170
>>>>>>>>> Int-IS: x972 2 930 9525
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> ncl-talk mailing list
>>>>>>>>> ncl-talk at ucar.edu
>>>>>>>>> List instructions, subscriber options, unsubscribe:
>>>>>>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Barry H. Lynn, Ph.D
>>>>>>> Senior Associate Scientist, Lecturer,
>>>>>>> The Institute of the Earth Science,
>>>>>>> The Hebrew University of Jerusalem,
>>>>>>> Givat Ram, Jerusalem 91904, Israel
>>>>>>> Tel: 972 547 231 170
>>>>>>> Fax: (972)-25662581
>>>>>>>
>>>>>>> C.E.O, Weather It Is, LTD
>>>>>>> Weather and Climate Focus
>>>>>>> http://weather-it-is.com
>>>>>>> Jerusalem, Israel
>>>>>>> Local: 02 930 9525
>>>>>>> Cell: 054 7 231 170
>>>>>>> Int-IS: x972 2 930 9525
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> --
>>>>>> Barry H. Lynn, Ph.D
>>>>>> Senior Associate Scientist, Lecturer,
>>>>>> The Institute of the Earth Science,
>>>>>> The Hebrew University of Jerusalem,
>>>>>> Givat Ram, Jerusalem 91904, Israel
>>>>>> Tel: 972 547 231 170
>>>>>> Fax: (972)-25662581
>>>>>>
>>>>>> C.E.O, Weather It Is, LTD
>>>>>> Weather and Climate Focus
>>>>>> http://weather-it-is.com
>>>>>> Jerusalem, Israel
>>>>>> Local: 02 930 9525
>>>>>> Cell: 054 7 231 170
>>>>>> Int-IS: x972 2 930 9525
>>>>>>
>>>>>> _______________________________________________
>>>>>> 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>
>>>>>
>>>>
>>>>
>>>> --
>>>> Barry H. Lynn, Ph.D
>>>> Senior Associate Scientist, Lecturer,
>>>> The Institute of the Earth Science,
>>>> The Hebrew University of Jerusalem,
>>>> Givat Ram, Jerusalem 91904, Israel
>>>> Tel: 972 547 231 170
>>>> Fax: (972)-25662581
>>>>
>>>> C.E.O, Weather It Is, LTD
>>>> Weather and Climate Focus
>>>> http://weather-it-is.com
>>>> Jerusalem, Israel
>>>> Local: 02 930 9525
>>>> Cell: 054 7 231 170
>>>> Int-IS: x972 2 930 9525
>>>>
>>>>
>>>
>>> --
>>> Barry H. Lynn, Ph.D
>>> Senior Associate Scientist, Lecturer,
>>> The Institute of the Earth Science,
>>> The Hebrew University of Jerusalem,
>>> Givat Ram, Jerusalem 91904, Israel
>>> Tel: 972 547 231 170
>>> Fax: (972)-25662581
>>>
>>> C.E.O, Weather It Is, LTD
>>> Weather and Climate Focus
>>> http://weather-it-is.com
>>> Jerusalem, Israel
>>> Local: 02 930 9525
>>> Cell: 054 7 231 170
>>> Int-IS: x972 2 930 9525
>>>
>>>
>>
>> --
>> Barry H. Lynn, Ph.D
>> Senior Associate Scientist, Lecturer,
>> The Institute of the Earth Science,
>> The Hebrew University of Jerusalem,
>> Givat Ram, Jerusalem 91904, Israel
>> Tel: 972 547 231 170
>> Fax: (972)-25662581
>>
>> C.E.O, Weather It Is, LTD
>> Weather and Climate Focus
>> http://weather-it-is.com
>> Jerusalem, Israel
>> Local: 02 930 9525
>> Cell: 054 7 231 170
>> Int-IS: x972 2 930 9525
>>
>>
>
> --
> Barry H. Lynn, Ph.D
> Senior Associate Scientist, Lecturer,
> The Institute of the Earth Science,
> The Hebrew University of Jerusalem,
> Givat Ram, Jerusalem 91904, Israel
> Tel: 972 547 231 170
> Fax: (972)-25662581
>
> C.E.O, Weather It Is, LTD
> Weather and Climate Focus
> http://weather-it-is.com
> Jerusalem, Israel
> Local: 02 930 9525
> Cell: 054 7 231 170
> Int-IS: x972 2 930 9525
>
>

-- 
Barry H. Lynn, Ph.D
Senior Associate Scientist, Lecturer,
The Institute of the Earth Science,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
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