[ncl-talk] Lat/lon labels

[Zilore Mumba]

Rick, thank you very much for pointing me to the right  resources. I tried
several things, and eventually the lat/lon labels came as I wanted them (as
you can see from the attachment). I am not really sure what fixed them
because I removed the resources I tried, but the labelling remains. I have
copied this to the list, though I am not sure if it may be useful.

On Sun, Apr 9, 2023 at 4:53 PM Rick Brownrigg <brownrig at ucar.edu> wrote:

> Hi Zilore,
>
> The specific error with ispan is that the function takes integers, not
> floats:
>
>    lats = ispan(-31,-28,1)
>
> There is an fspan  function if that's what you really want; it behaves a
> bit differently:
>
>     https://www.ncl.ucar.edu/Document/Functions/Built-in/fspan.shtml
>
> More to your question, I'm not expert with labelling axes, so I always
> have to experiment. If fixing the ispan() error doesn't get you the labels
> you want, you might look at the examples on tickmarks for how to custom
> label axes:
>
>      https://www.ncl.ucar.edu/Applications/tickmarks.shtml
>
> Hope that helps...
> Rick
>
> On Sun, Apr 9, 2023 at 1:59 AM Zilore Mumba via ncl-talk <
> ncl-talk at mailman.ucar.edu> wrote:
>
>> My script,figure attached, outputs one longitude and one latitude labels
>> only. In the code snippet below, I have turned on gridlines and they draw
>> ok.
>> From this script
>> https://www.ncl.ucar.edu/Applications/Scripts/mapgrid_6.ncl I was
>> guessing that I could put latitude and longitudes labels using the code
>> reproduced below. This gives me the error (lats = ispan(-31.,-28.,1.)
>> "fatal:ispan: arguments must be of an integral type, can't continue"
>> How does one get customized lat/lon labels?
>>
>>        res at mpGridAndLimbOn        = True               ; turn on grid
>> lines
>>        res at mpGridSpacingF         = 0.5
>>
>>      ;---Create lat/lon arrays for location of latitude labels.
>>        ;lats = ispan(-31.,-28.,1.)
>>        ;nlat = dimsizes(lats)
>>        ;lons = new(nlat,integer)
>>        ;lons = 0
>>
>>        ;---Resources for text strings
>>        ;txres               = True
>>        ;txres at txFontHeightF = 0.015
>>        ;dum = gsn_add_text(wks,plot,""+lats,lons,lats,txres)
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