-dpng gives "invalid command"

[Thomas Treichl]

John B. Thoo schrieb:
> Hi, Thomas.
> 
> I installed your Gnuplot.app in my Applications folder and set the 
> following symlink:
> 
>   sudo ln -sfv /Applications/Gnuplot.app/Contents/Resources/bin/gnuplot 
> /usr/bin/gnuplot
> 
> In gnuplot, I find that
> 
> gnuplot> system ('which gnuplot')
> /Applications/Gnuplot.app/Contents/Resources/bin/gnuplot
> gnuplot>
> 
> so I think it all looks OK.  I also tried to print a PNG and that 
> worked: yea! :-)
> 
> The only difference I see immediately between using Gnuplot.app and the 
> gnuplot I had complied from source (besides now being able to print a 
> PNG) is that the redrawing in Gnuplot.app seems to be slower, so that 
> the following, which produced a pretty smooth animation in gnuplot, 
> produces a somewhat jerky animation in Gnuplot.app:
> 
>     lT = length (T) - 1;
>     N = 10;   % number of time intervals (frames) to plot (must have N 
> <= lT)
> 
>     if (N > lT)
>       error ('N > lT;  need  N <= lT');
>     end
> 
>     time = ones (1, N);
>     time(2:N+1) = floor ((lT/N)*(1:N)) + 1;
> 
>     for j = 1:N+1   % for "ode45"
>       plot (x, u(:,time(j)));
>       title (strcat ('time =', num2str ((tf-t0)*(time(j) - 1)/lT)));
> %      axis ([0 2*pi -1.5 1.5]);
>       axis([0 2*pi 2*min(real(u0)) 2*max(real(u0))]);
>       pause(wait);
>     end
> 
> I'm not sure why.
> 
> Btw, while I was at it, I also upgraded Octave to 3.2.0.
> 
> Thanks for making this all very simple.
> 
> ---John.

Hi John,

are you using the same backends (which one of X11 or AquaTerm) for animations 
with gnuplot and Gnuplot.app? And which version of gnuplot is it?

Best regards,

   Thomas