-dpng gives "invalid command"

[Ben Abbott]

On Jul 14, 2009, at 3:11 PM, "John B. Thoo" <jthoo at yccd.edu> wrote:

> On Jul 10, 2009, at 11:55 AM, Thomas Treichl wrote:
>
>> John B. Thoo schrieb:
>>> On Jul 10, 2009, at 11:29 AM, Thomas Treichl wrote:
>>>> John B. Thoo schrieb:
>>>>> Hi, Thomas.
>>>>> gnuplot> show version long
>>>>>        G N U P L O T
>>>>>        Version 4.2 patchlevel 5
>>>>>        last modified Mar 2009
>>>>>        System: Darwin 8.11.0
>>>>>        Copyright (C) 1986 - 1993, 1998, 2004, 2007 - 2009
>>>>>        Thomas Williams, Colin Kelley and many others
>>>>>        Type `help` to access the on-line reference manual.
>>>>>        The gnuplot FAQ is available from http://www.gnuplot.info/faq/
>>>>>        Send bug reports and suggestions to <http://sourceforge.net/projects/gnuplot 
>>>>> >
>>>>> Compile options:
>>>>> +READLINE  -LIBREADLINE  +HISTORY  +BACKWARDS_COMPATIBILITY   
>>>>> +BINARY_DATA
>>>>> -LIBGD
>>>>> -NOCWDRC  +X11  +X11_POLYGON  +MULTIBYTE  +USE_MOUSE   
>>>>> +HIDDEN3D_QUADTREE
>>>>> +DATASTRINGS  +HISTOGRAMS  +OBJECTS  +STRINGVARS  +MACROS  +IMAGE
>>>>> DRIVER_DIR     = "/usr/local/libexec/gnuplot/4.2"
>>>>> GNUPLOT_PS_DIR = "/usr/local/share/gnuplot/4.2/PostScript"
>>>>> HELPFILE       = "/usr/local/share/gnuplot/4.2/gnuplot.gih"
>>>>> gnuplot>
>>>>> Thanks.
>>>>> ---John.
>>>>
>>>> Then yes, you're right - you're missing support for *png. Your  
>>>> version of Gnuplot has not been compiled against libgd. libgd  
>>>> (and libpng and libjpg...) is the library that you need to create  
>>>> graphics in *png, *jpg and *gif.
>>>>
>>>> As your binary is in /usr/local I would expect you either compile  
>>>> and install Gnuplot for yourself or you use MacPorts? Either or,  
>>>> you need a binary that should give you something like this to  
>>>> save in *png on your Mac (compare compile options GD_* from my  
>>>> machine with yours):
>>>>
>>>>  gnuplot> show version long
>>>>
>>>>        G N U P L O T
>>>>        Version 4.2 patchlevel 5
>>>>        last modified Mar 2009
>>>>        System: Darwin 8.11.1
>>>>
>>>>        Copyright (C) 1986 - 1993, 1998, 2004, 2007 - 2009
>>>>        Thomas Williams, Colin Kelley and many others
>>>>
>>>>        Type `help` to access the on-line reference manual.
>>>>        The gnuplot FAQ is available from http://www.gnuplot.info/faq/
>>>>
>>>>        Send bug reports and suggestions to
>>>>  <http://sourceforge.net/projects/gnuplot>
>>>>
>>>>  Compile options:
>>>>  -READLINE  +LIBREADLINE  +HISTORY  +BACKWARDS_COMPATIBILITY  
>>>> +BINARY_DATA
>>>>  +GD_PNG  +GD_JPEG  +GD_GIF  +ANIMATION
>>>>  -NOCWDRC  +X11  +X11_POLYGON  +MULTIBYTE  +USE_MOUSE   
>>>> +HIDDEN3D_QUADTREE
>>>>  +DATASTRINGS  +HISTOGRAMS  +OBJECTS  +STRINGVARS  +MACROS  +IMAGE
>>>>
>>>>  DRIVER_DIR     =
>>>> "/Users/Thomas/bin/Octave.app.3.2.0/Gnuplot.app/Contents/ 
>>>> Resources/libexec/gnuplot/4.2"
>>>>  GNUPLOT_PS_DIR = "/tmp/gnuplot-i386/share/gnuplot/4.2/PostScript"
>>>>  HELPFILE       = "/Users/Thomas/bin/Octave.app.3.2.0/Gnuplot.app/ 
>>>> Contents/Resources/share/gnuplot/4.2/gnuplot.gih"
>>>>
>>>> Hope this helps somehow,
>>>>
>>>>  Thomas
>>> Hi, Thomas.
>>> Yes, I compiled gnuplot myself.  (I guess that was a mistake.)   
>>> Would the easiest thing for me to do now be to install gnuplot  
>>> from your octave-3.2.0-ppc.dmg?
>>> If I drag-and-drop gnuplot from the .dmg into my Applications  
>>> folder, would I then have to do anything in particular to use it  
>>> instead of my previous installation?
>>> Thanks again.
>>> ---John.
>>
>> Hi John,
>>
>> why a mistake? From my point of view it is good if you try to  
>> compile things for yourself. You just need to set up some more  
>> libraries before compiling Gnuplot.
>>
>> Suggestion: If you already use Fink or MacPorts then this might be  
>> a better solution to install Gnuplot that way. If you have none of  
>> those or prefer Gnuplot.app beside others you can also use  
>> Gnuplot.app, yes. There nearly is nothing more to do: Drag'n'Drop  
>> Gnuplot.app from the *dmg to your Applications folder and then set  
>> another link to use Gnuplot.app from command line, too (maybe you  
>> should remove or rename or uninstall /usr/local/bin/gnuplot* before):
>>
>>  sudo ln -s /Applications/Gnuplot.app/Contents/Resources/bin/ 
>> gnuplot /usr/local/bin/gnuplot
>>
>> Finally just type 'gnuplot' in Terminal.app and check once again  
>> 'show version long'. Start your Octave and check
>>
>>  octave-3.2.0:1> system ('which gnuplot')
>>
>> Best regards,
>>
>>  Thomas
>
> 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.

This is due to a *feature* of 3.2. A patch has been committed.

Ben