Re: Text annotations not appearing when floats are used in XY plot with modified axis labels

From: Carmen St. Jean <carmen.stjean_at_nyahnyahspammersnyahnyah>
Date: Wed Jun 20 2012 - 13:40:05 MDT

Hello Mary,

Thanks for looking into it and also for opening a ticket! I hope we
can figure this out. I have been able to get Oleksandr's solution to
work only in the simple version of my script, so I'm glad you wrote to

Your solution works in the complicated version of my script, but
depending on the values of the x-axis. For example, in one of my
plots, x ranges from 61 to 63 degrees Fahrenheit, so the data gets
squished to the right side of the plot since the x-axis is ranging
from 0 to 63. I tried to set res.trXMinF to the minimum temperature
instead, but this made the text annotations disappear.

As for my x-axis and y-axis relabeling, is there a better way of going
about that? The way I'm doing it now seems to be part of the problem
here; this was the only approach I could think of with my limited
PyNGL experience.

Thank you,


On Wed, Jun 20, 2012 at 2:43 PM, Mary Haley <> wrote:
> Hi Carmen,
> Thanks for providing a set of scripts that illustrate the problem.
> This has me completely puzzled.
> I thought it had something to do with the range of your Y axis. Through some trial and error, I found that adding:
> res.trXMinF = 0
> to the code causes the labels to show up.  This really makes no sense, because "trXMinF" is actually getting set to 0.0 internally.
> I'll look into this some more, but hopefully the work-arounds are acceptable for you at the moment. The trouble ticket on this is PyNGL-71.
> --Mary
> On Jun 20, 2012, at 10:49 AM, Carmen St. Jean wrote:
>> Hello again Oleksandr,
>> You're right!  (It looks like I got your code mixed up with mine of
>> the same name; I thought I overwrote my old one but hadn't.  Sorry
>> about that.)  It works indeed...  Thanks so much!
>> Carmen
>> On Wed, Jun 20, 2012 at 12:43 PM, Oleksandr Huziy <> wrote:
>>> They are also floats in the script I have sent you. But the labels are
>>> showing. I was guessing that with x=y=0, you somehow got your captions
>>> outside the figure.
>>> Cheers
>>> --
>>> Oleksandr
>>> 2012/6/20 Carmen St. Jean <>
>>>> Hi Oleksandr,
>>>> I'm sorry; I really wasn't very clear about which float and integer
>>>> values I was referring to.  The x and y values I meant are the x and y
>>>> inputs for the Ngl.xy() function, not any positioning values for calls
>>>> to the Ngl.text() function.  Please see the plotTemps,
>>>> plotElevsMeters, and plotElevsFeet variables in my code.
>>>> Thanks,
>>>> Carmen
>>>> On Wed, Jun 20, 2012 at 12:30 PM, Oleksandr Huziy <>
>>>> wrote:
>>>>> Hi,
>>>>> I am just a beginner with pyngl, but when I put x=0.1 and y=-0.1
>>>>> in Ngl.text it kind of works. See the attached script.
>>>>> Cheers
>>>>> --
>>>>> Oleksandr (Sasha) Huziy
>>>>> Phd student, UQAM
>>>>> 2012/6/20 Carmen St. Jean <>
>>>>>> Hello,
>>>>>> I've run into the most puzzling problem with my code under extremely
>>>>>> specific circumstances.
>>>>>> I have an xy plot where I have modified the x-axis and y-axis labels
>>>>>> in order to show additional units (i.e., degrees F in addition to
>>>>>> degrees C and feet in addition to meters).  Then I am attempting to
>>>>>> place three lines of text above my plot and three lines of text below
>>>>>> my plot by using text annotations.
>>>>>> The problem is that the text above and below the plot only appear when
>>>>>> I am using integer values instead of floats for x and y.  Or if I use
>>>>>> floats while I don't bother modifying my x-axis and y-axis labels,
>>>>>> then the text does appear.  But if I modify the axis labels and use
>>>>>> floats, then the text annotations simply do not appear.  It is
>>>>>> surprising that this is happening because I was able to modify the
>>>>>> labels x-axis and y-axis of a contour plot and successfully add text
>>>>>> above and below the plot.  The input I gave the contour function was
>>>>>> all float values.
>>>>>> So this leaves me unsure of where the underlying problem is...  Is my
>>>>>> approach to modifying my labels is problematic so that it is somehow
>>>>>> affecting the text annotations down the road (though only when I am
>>>>>> using floats for x and y)?  Is there something I have overlooked here?
>>>>>> Thanks,
>>>>>> Carmen
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Received on Wed Jun 20 13:40:17 2012

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