On Fri, Jun 10, 2016 at 3:30 PM, Thomas D. Dean <address@hidden> wrote:
> gnuplot --version
gnuplot 5.1 patchlevel 0
octave:491> ver
----------------------------------------------------------------------
GNU Octave Version: 4.1.0+
GNU Octave License: GNU General Public License
Operating System: Linux 3.13.0-86-generic #131-Ubuntu SMP Thu May 12 23:33:13 UTC 2016 x86_64
...
>From the doc, 28.5 Polynomial Interpolation, shows a plot of points plus two lines. I can not reproduce this. The 'dots' are connected with lines so I get a scribble across the plot of the two lines.
Is this a gnuplot problem?
x = 2 * pi * rand (1, 200);
y = sin (x) + sin (2 * x) + 0.2 * randn (size (x));
## Uniform breaks
breaks = linspace (0, 2 * pi, 41); % 41 breaks, 40 pieces
pp1 = splinefit (x, y, breaks);
## Breaks interpolated from data
pp2 = splinefit (x, y, 10); % 11 breaks, 10 pieces
## Plot
xx = linspace (0, 2 * pi, 400);
y1 = ppval (pp1, xx);
y2 = ppval (pp2, xx);
plot (x, y, ".", xx, [y1; y2])
axis tight
ylim auto
legend ({"data", "41 breaks, 40 pieces", "11 breaks, 10 pieces"})
How do I plot points?
Tom Dean
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Yes gnuplot seems to not work for this
put this at the top of your file: