Re: [ferret_users] empty plot without error

To: Ryo Furue <furue@xxxxxxxxxx>

Subject: Re: [ferret_users] empty plot without error

From: Joshua Osborne - NOAA Affiliate <joshua.osborne@xxxxxxxx>

Date: Tue, 6 Oct 2020 11:47:44 -0700

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Hi Ryo,

It looks like you are correct about PyFerret not finding the range of xs_rot_sft. I have tried the following with the file you provided:

yes? plot/i=370:380/vs xs_rot_sft, ys_rot_sft

which produces the plot, and

yes? plot/i=1:5/vs xs_rot_sft, ys_rot_sft

which does not (blank image).

Explicitly setting the limits like so,

yes? plot/vs/hlim=112:115/vlim=-25:0 xs_rot_sft, ys_rot_sft

will also produce a plot. This seems to suggest that there is an issue with

I have created an issue on github for this: https://github.com/NOAA-PMEL/PyFerret/issues/80. I'll add updates there as I look into this.

Thanks,

Joshua

On Sat, Oct 3, 2020 at 8:53 AM Ryo Furue <furue@xxxxxxxxxx> wrote:

Dear Ferret users and developer team,

I've come across a very strange phenomenon:

yes? set data track-rot_sft.nc
yes? plot/vs xs_rot_sft, ys_rot_sft

results in an empty window. No axes and no letterings. Just perfectly white. There are absolutely no error messages. [Is this because all the x values are (almost) the same? so that Ferret has failed to determine the range of the horizontal axis?]

Either variable can be listed and plotted:

yes? list xs_rot_sft
yes? plot xs_rot_sft

Only "plot/vs" fails to work.

This problem occurs on three different machines (Linux, Linux, macOS) with these versions of pyferret:

PyFerret v7.5 (optimized)
Linux 4.15.0-1061-azure - 11/14/19

PyFerret v7.6 (optimized)
Linux 4.15.0-1089-azure - 06/25/20

PyFerret v7.6 (optimized)
Darwin 18.7.0 - 06/25/20

I take the liberty of attaching the netCDF file that contains these two 1D variables.

Ryo