Re: [Gnuplot-info] Invalid Graphics Files generated : WAS: Re: Series labels from data file?

[t.sefzick <t.s...@fz...>]

if you
'set output some_filename.jpg'
and then
'set table'
the table goes to the file,
'unset table'
'plot something....'
and then the graphics-output is appended.
that's why your graphic files are corrupt: they have
the human readable data table in front.

you should:
'set term'
'set table'
# do the dummy plot
'unset table'
'set output some_filename.jpg'
'plot ...'
'set output'

On Sat, Oct 31, 2009 at 12:51:45AM +0100, Steve Cohen wrote:
> Aargh.  Thunderbird mangled my "table".
>
> Let me try a text description instead
>
> In the Iterative folder the data file contains a single run of data.
> The script that processes it uses the "plot for [i in datasetnames"
> notation (gnuplot 4.5).  The script produces a non-readable jpeg file.
>
> In the NonIterative folder, the data is the same but with double
> line-feeds manually inserted.  The script uses the hardcoded series
> names and is gnuplot 4.0 compatible.  The script produces a readable
> jpeg file.
>
> Both scripts were run on their respective datasets in separate command
> line instances:
>     gnuplot-4.5 <scriptfile>
>
> This leads me to the conclusion that the bug is in the iterative (plot
> for) mechanism itself, perhaps in conjunction with the terminal stuff.
>
>
>
>
> Steve Cohen wrote
> > ...
> >
> > Steve Cohen wrote:
> >> Steve Cohen wrote:
> >>
> >>> Steve Cohen wrote:
> >>>
> >>>> t.sefzick wrote:
> >>>>
> >>>>> On Fri, Oct 30, 2009 at 03:31:34PM +0100, Steve Cohen wrote:
> >>>>>
> >>>>>> Sorry to keep bugging you but I feel that I am on the cusp of
> >>>>>> getting
> >>>>>> something running that's really useful and it's driving me crazy
> >>>>>> that
> >>>>>> I'm not quite there.
> >>>>>>
> >>>>>> Speaking now of Ubuntu, where I have complete control of the
> >>>>>> system, I
> >>>>>> wonder why gif, png, and jpeg appear to be supported, yet do not
> >>>>>> generate usable files. I don't know what "libgd with gif support"
> >>>>>> etc.
> >>>>>> actually means. What form does this "support" take?
> >>>>>>
> >>>>> some 'libgd' versions came without the ability to produce gif-files
> >>>>> due to licence problems. this has changed now, so actual 'libgd'
> >>>>> versions
> >>>>> are able to produce gif-files (that's meant by 'support').
> >>>>> the configure-program searches for the installed gd-lib and depending
> >>>>> on it's capabilities prepares the compilation process to compile
> >>>>> the png-, jpeg- and (eventually) gif-terminal.
> >>>>>
> >>>>> what du you mean by 'do not generate usable files'?
> >>>>> do the following gnuplot-commands
> >>>>>
> >>>>> set term gif
> >>>>> set out 'tmp.gif'
> >>>>> test
> >>>>> set out
> >>>>>
> >>>>> not produce a readable gif-file?
> >>>>>
> >>>>>
> >>>> correct.
> >>>> "Could not load image 'getcallstats.gif'. File does not appear to
> >>>> be a GIF file"
> >>>> "Could not load image 'getcallstats.png'. Fatal error reading PNG
> >>>> image file: Not a PNG file"
> >>>> "Could not load image 'getcallstats.jpeg'. Error interpreting JPEG
> >>>> image file (Not a JPEG file: starts with 0x0a 0x23).
> >>>>
> >>>> These were all generated by gnuplot 4.5 built from CVS on Ubuntu 9.04.
> >>>>
> >>>>
> >>> Additional results.
> >>> I have now been able to compile a version of gnuplot 4.5 on RHEL 5.3
> >>> with the approprate libgd support. However results are unreliable.
> >>> Sometimes viable GIF and JPEG files are created, other times the
> >>> files created are rejected by viewer apps. Since these results are
> >>> seen on two different platforms, I wonder if it is a bug in 4.5?
> >>>
> >>>
> >> Actually, to answer your original question, I'm finding that the
> >> .gif, .jpeg, and .png files generated by the test command in the
> >> various terminal modes do produce readable files, the but the files
> >> produced by the plot command are often (but not always) unreadable.
> >>
> >>
> >> ------------------------------------------------------------------------------
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> >>
> >>
> >
>



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