Re: Replace Frequency With Percent in Histogram

From: Dan Barrie <dbarrie_at_nyahnyahspammersnyahnyah>
Date: Thu Mar 18 2010 - 08:03:40 MDT

That worked perfectly, and having edited gsn_code.ncl for the first
time, I'd like to thank you for how well-written and commented the code is.

For anyone else who reads this thread in the future, I found it
necessary to change two more things:

1. Get rid of the "Percent" label on the right Y-axis. This is
accomplished by altering line 7764 of the code (gsn_code.ncl). I changed
the line _perc_String = "Percent"_ to _perc_String = ""_
2. To get rid of the tick marks on the right Y-axis, I added the
following resource to my histogram script: res@tmYROn = False

Mary, I have one more question about this histogram. The only remaining
issue is that the left y-axis is being scaled to frequency values, not
percentage values, which is a problem, since my data sets have different
numbers of data points, and I am automating their handling as much as
possible. For example, 40% in one data set might be 8000 points, but 40%
in another data set might be 1000 points. I would like to keep the
scaling constant, so is there a way to switch the scaling so that the
left y-axis can be scaled by percentage? Thanks!

-Dan

Mary Haley wrote:
> Hi Dan,
>
> The histogram code only allows you to put these special labels on the
> right.
>
> If you want to put them on the left, you will need to make a personal
> copy of $NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl and edit it.
>
> Where you see the lines:
>
> set_attr(res2,"tmYUseLeft", False)
> set_attr(res2,"tmYROn",True)
> set_attr(res2,"tmYRLabelsOn",True)
> set_attr(res2,"tmYRMode","Explicit")
> set_attr(res2,"tmYRValues",bins_at_pnice)
> set_attr(res2,"tmYRMinorValues",bins_at_pmnice)
> if(percentsign)
> set_attr(res2,"tmYRLabels",pnice+"%")
> else
> set_attr(res2,"tmYRLabels",pnice)
> end if
>
>
> You will want to change YR to YL.
>
> I haven't actually tested this, so let me know if it doesn't work.
>
> You will also need to do Dennis' suggestion below of setting
> tiYAxisString to "Percent" or "%".
>
> --Mary
>
>
> On Mar 17, 2010, at 9:28 AM, Dennis Shea wrote:
>
>> Try
>>
>> res@tiYAxisString = "Percent"
>>
>> On 03/17/2010 08:36 AM, Dan Barrie wrote:
>>> Dear NCL users,
>>>
>>> I would like to replace the default histogram left Y-Axis values for
>>> "Frequency" with "Percent", which appears on the right Y-Axis by
>>> default
>>> when res@gsnHistogramComputePercentages is set to True. Does anyone
>>> have
>>> a suggestion for how to do this? Thanks.
>>>
>>> -Dan
>>> _______________________________________________
>>> ncl-talk mailing list
>>> List instructions, subscriber options, unsubscribe:
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>>
>>
>> --
>> ======================================================
>> Dennis J. Shea tel: 303-497-1361 |
>> P.O. Box 3000 fax: 303-497-1333 |
>> Climate Analysis Section |
>> Climate & Global Dynamics Div. |
>> National Center for Atmospheric Research |
>> Boulder, CO 80307 |
>> USA email: shea 'at' ucar.edu |
>> ======================================================
>> _______________________________________________
>> ncl-talk mailing list
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>

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Received on Thu Mar 18 08:04:09 2010

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