[ncl-talk] Issue with creating a bar chart plot

[Dave Allured - NOAA Affiliate]

It is only the horizontal axis that needs to be monotonically increasing.
That is probably what the error message is about.  Naturally, the vertical
access may fluctuate anywhere.  You might want to check the values of
x_axis in your code to see if they make sense.

Meanwhile, you should be able to insert a quick fix for x_axis with
temporary arrays, something like this.  This assumes that x_axis is
strictly decreasing rather than increasing.  If you change the order, then
you must also change the order for the vertical axis data, in the same
way.  X and Y values are supposed to form ordered pairs to make the bar
chart.

xplot = x_axis(::-1)
yplot = tolong (temperature_top(i,23:0:-1))
plot = gsn_csm_xy (wks, xplot, yplot, res)

I have no idea what changed to cause a newer NCL version to change from the
original behavior.


On Sun, Jun 7, 2020 at 1:57 PM Andrew Kren - NOAA Affiliate via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Dear ncl-talk,
>
> I upgraded my NCL to the latest version. Previously I was using version
> 6.5. When I upgraded, one of my ncl codes no longer runs successfully but
> creates an error code. I am creating a bar chart with gsn_csm_xy. I
> originally did not get these errors so I am unsure what could be going on.
> I tried to debug the issue but to no avail. Here are my errors:
>
> (0) get_bar_widths: Warning: The bar width(s) you selected (0.75) is
> larger than the smallest delta (-11).
>
> (0) Defaulting to -11.
>
> (0) get_bar_arrays: Fatal: The array is not monotonically increasing.
>
> (0) Cannot draw a bar chart.
>
> fatal:Illegal right-hand side type for assignment
>
>
> I checked that my array I am plotting has all correct values, and it does.
> I didn't know a bar chart had to have monotonically increasing values. Is
> there a way around this?
>
>
> The code where it fails is below, in the call to plot.
>
>
> plot = gsn_csm_xy(wks,x_axis,tolong(temperature_top(i,0:23)),res)
>
> Thanks,
>
> --
> Andrew Kren
> Meteorologist
> US Dept of Commerce
> National Oceanic and Atmospheric Administration
> National Weather Service Raleigh, NC
> 1005 Capability Drive, Suite 300
> Centennial Campus
> Raleigh, NC 27606-5226
>
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