Re: Line plotting not working in an Octave 3.8.1 script

[Fausto Arinos de A. Barbuto]

Hi Ben,

Thanks for your help.

Well, nothing different happens when I add the command you suggested.

Except, the blue diamonds get uglier (as if their contours were kind

of blurred).

And, sorry for that, but I forgot to say that the following command:

plot(arg,t,'bd',arg,sqrt(arg)*besselj(1, 2.0*sqrt(2.0*arg)),'ro');

plots BOTH curves -- the 1st with blue diamonds, the 2nd with red

little circles.  So, the problem is apparently related to the use of

lines as markers.  Mystery.

Fausto

On Wednesday, June 11, 2014 11:20:44 AM, Ben Abbott <address@hidden> wrote:

On Jun 11, 2014, at 10:17 AM, Fausto Arinos de A. Barbuto <address@hidden> wrote:

> Hi,
>
> I wrote a script containing a plot() command aimed at plotting two
> curves on the same chart.  When the command has the following form:
>
> plot(arg,t,'bd',arg, sqrt(arg)*besselj(1, 2.0*sqrt(2.0*arg)),'r-');
>
> The 1st curve is plotted with neat blue diamonds but the second
> curve, that should display a red line, is not plotted.  Then when
> I invert the markers:
>
> plot(arg,t,'r-',arg, sqrt(arg)*besselj(1, 2.0*sqrt(2.0*arg)),'bd');
>
> The 2nd curve is plotted with blue diamonds, but now the 1st curve
> is not there.
>
> And finally, when I try this:
>
> plot(arg,t,'r-',arg, sqrt(arg)*besselj(1, 2.0*sqrt(2.0*arg)),'b-');
>
> Nothing is plotted at all.  A blank chart shows only axes and axes'
> titles.  Same behaviour on either Windows, Linux or Cygwin-X.  I'm
> using the experimental GUI.
>
> Nevertheless, in "command line mode", the following lines produce
> the expected, correct results:
>
> >> t = [0:0.05:10];
> >> plot(t,sin(t),'bd',t,cos(t),'r-');
>
> What's going on here?  Any hints?
>
> Thanks,
>
> Fausto

I assume there is some psuedo anti-aliasing algorithm that is to blame?

What happens if you widen the lines by ...

    set (findobj (gcf (), "-property", "linewidth"), "linewidth", 2)

Ben