[Octave-bug-tracker] [bug #57336] line () function: plot becomes faint when many points are given

[Hg200]

URL:
  <https://savannah.gnu.org/bugs/?57336>

                 Summary: line () function: plot becomes faint when many
points are given
                 Project: GNU Octave
            Submitted by: hg200
            Submitted on: Sun 01 Dec 2019 08:12:19 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

    _______________________________________________________

Details:

Hello,

when the line() command is called with more and more points, the plot output
becomes more and more transparent. The attached picture shows the behaviour of
the following MWE for N = 20000 and N = 1000.

++
N = 20000;
r = linspace (1, 50, N);
phi = linspace (0, 20*2*pi(), N);
x = r.*cos (phi);
y = r.*sin (phi);
z = 20*sin (phi);
line ("xdata", x, "ydata", y, "zdata", z, "color", "r");
axis equal;
view (3);
--

hg summary
parent: 27680:f998e243fa78 
branch: stable

Note: This topic is also related to the function streamline. The streamline
plot becomes faint if the integrator step size is set very small.





    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Sun 01 Dec 2019 08:12:19 PM UTC  Name: line_plot.png  Size: 78KiB   By:
hg200

<http://savannah.gnu.org/bugs/download.php?file_id=47960>

    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?57336>

_______________________________________________
  Message sent via Savannah
  https://savannah.gnu.org/