-dpng gives "invalid command"

[Thomas Treichl]

John B. Thoo schrieb:
> On Jul 10, 2009, at 10:56 AM, Ben Abbott wrote:
>> On Friday, July 10, 2009, at 12:37PM, "John B. Thoo"  
>> <jthoo at yccd.edu> wrote:
>>> Hi, everyone.
>>>
>>> I can save a plot to EPS by
>>>
>>>   print ("foo.eps", "-deps")
>>>
>>> but when I try to save a plot to PNG by
>>>
>>>   print ("foo.png", "-dpng")
>>>
>>> I get a run of errors like
>>>
>>>
>>> gnuplot> e
>>>          ^
>>>          line 0: invalid command
>>>
>>>
>>> and no plot is saved.
>>>
>>> What am I doing wrongly?
>>>
>>> I'm using Octave 3.0.5 and gnuplot 4.2 patchlevel 5 in an X11 xterm
>>> window in Mac OS X 10.4.11.
>>>
>>> Thanks.
>>>
>> I have no problem producing png output with 3.2 and gnuplot 4.2.5.
>>
>> Can you run gnuplot and try ...
>>
>>     set term png
>>     set output foo.png
>>     plot sin(x)
>>     quit
>>
>> Do you still get the error?
> 
> Hi, Ben.  When I open gnuplot separately from Octave and try to "set  
> term png", I get this error:
> 
> 
> [533] bash-2.05b$ gnuplot
> 
>          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>
> 
> 
> Terminal type set to 'aqua'
> gnuplot> set term png
>                    ^
>           unknown or ambiguous terminal type; type just 'set  
> terminal' for a list
> 
> gnuplot>
> 
> 
> When I type just "set terminal" for a list of available terminals  
> types, I get:
> 
> Available terminal types:
>             aed512  AED 512 Terminal
>             aed767  AED 767 Terminal
>               aifm  Adobe Illustrator 3.0 Format
>               aqua  Interface to graphics terminal server for Mac OS X
>           bitgraph  BBN Bitgraph Terminal
>                cgm  Computer Graphics Metafile
>              corel  EPS format for CorelDRAW
>               dumb  ascii art for anything that prints text
>                dxf  dxf-file for AutoCad (default size 120x80)
>              eepic  EEPIC -- extended LaTeX picture environment
>                emf  Enhanced Metafile format
>              emtex  LaTeX picture environment with emTeX specials
>           epslatex  LaTeX picture environment using graphicx package
>       epson_180dpi  Epson LQ-style 180-dot per inch (24 pin) printers
>        epson_60dpi  Epson-style 60-dot per inch printers
>        epson_lx800  Epson LX-800, Star NL-10, NX-1000, PROPRINTER ...
>                fig  FIG graphics language for XFIG graphics editor
>               gpic  GPIC -- Produce graphs in groff using the gpic  
> preprocessor
>            hp2623A  HP2623A and maybe others
>             hp2648  HP2648 and HP2647
>             hp500c  HP DeskJet 500c, [75 100 150 300] [rle tiff]
>               hpdj  HP DeskJet 500, [75 100 150 300]
>               hpgl  HP7475 and relatives [number of pens] [eject]
>             hpljii  HP Laserjet series II, [75 100 150 300]
>               hppj  HP PaintJet and HP3630 [FNT5X9 FNT9X17 FNT13X25]
>             imagen  Imagen laser printer
>         kc_tek40xx  MS-DOS Kermit Tek4010 terminal emulator - color
>         km_tek40xx  MS-DOS Kermit Tek4010 terminal emulator - monochrome
>              latex  LaTeX picture environment
>                 mf  Metafont plotting standard
>                mif  Frame maker MIF 3.00 format
>                 mp  MetaPost plotting standard
>            nec_cp6  NEC printer CP6, Epson LQ-800 [monocrome color  
> draft]
>            okidata  OKIDATA 320/321 Standard
>                pbm  Portable bitmap [small medium large] [monochrome  
> gray color]
>               pcl5  HP Designjet 750C, HP Laserjet III/IV, etc. (many  
> options)
>         postscript  PostScript graphics, including EPSF embedded  
> files (*.eps)
>            pslatex  LaTeX picture environment with PostScript \specials
>              pstex  plain TeX with PostScript \specials
>           pstricks  LaTeX picture environment with PSTricks macros
>                qms  QMS/QUIC Laser printer (also Talaris 1200 and  
> others)
>              regis  REGIS graphics language
>            selanar  Selanar
>              starc  Star Color Printer
>                svg  W3C Scalable Vector Graphics driver
>        tandy_60dpi  Tandy DMP-130 series 60-dot per inch graphics
>            tek40xx  Tektronix 4010 and others; most TEK emulators
>            tek410x  Tektronix 4106, 4107, 4109 and 420X terminals
>            texdraw  LaTeX texdraw environment
>               tgif  TGIF X11 [mode] [x,y] [dashed] ["font" [fontsize]]
>           tkcanvas  Tk/Tcl canvas widget [perltk] [interactive]
>               tpic  TPIC -- LaTeX picture environment with tpic  
> \specials
>            unknown  Unknown terminal type - not a plotting device
>              vttek  VT-like tek40xx terminal emulator
>                x11  X11 Window System
>               xlib  X11 Window System (gnulib_x11 dump)
> (END)
> 
> 
> so I see that png is not on the list.  (No "gif" either.)  Hmm ... I  
> guess that explains it.   What do you suggest I do?
> 
> Thanks.
> 
> ---John.

Can you please once again type 'show version long' in Gnuplot and send the 
output of this command once again? Thanks, Thomas