[Octave-bug-tracker] [bug #48616] Matlab compatibility for semilogx() and xlim([0 uplim])

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?48616>

                 Summary: Matlab compatibility for semilogx() and xlim([0
uplim]) 
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sun 24 Jul 2016 01:25:37 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: Franz Wankelhuber
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.3
        Operating System: Microsoft Windows

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Details:

If you're trying to plot with semilogx and scaling the x-axis with xlim from 0
to some upper value, the lower bound at 0 in xlim causes a 

opengl_renderer: data values greater than float capacity.  (1) Scale data, or
(2) Use gnuplot

warning. No plot output is produced in this case.

Some test code to reproduce the warning:


xf = 1:2048;
fs = 48000;
semilogx(linspace(0, fs, 2048), xf);
xlim([0 fs/2]);


Matlab seems to avoid the 0 lower limit problem by simply omitting the very
first sample in the vector to be plotted.




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