Problems with gnuplot and jpg output

[Ben Abbott]

On Jun 5, 2009, at 3:57 PM, Webb Sprague wrote:

>> Hello,
>> look at the help for octave's "print" command and select the output  
>> (to file
>> - "look for "-dDEVICE" parameter) that fits your needs. You can  
>> generate
>> many types of files, e.g. EPS, PNG, JPEG ... all of them are  
>> included.
>
> Problem is you can't run this before the plot command, which is where
> the errors come from.  (I actually know matlab/ octave pretty well --
> at least I have plotted and then printed many times....)
>
>> So I hope this helps.
>
> Well, I am getting closer ... thanks!

I don't know why you're getting gnuplot errors when using x11 ...  
unless your gnuplot doesn't recognize x11. Please run gnuplot, type  
"show var GPVAL_TERMINALS", and let us know what terminals are listed.  
Once we see what terminals your gnuplot supports you'll need to create  
the environment variable "GNUTERM" and set it equal to the terminal  
name that displays correctly for you.

As I'm not a windows user, but looking at octave's source it looks  
like you need to have "GNUTERM=windows". If my inference is correct,  
when you run octave you can do that by

	setenv ("GNUTERM", "windows")

Regarding plot/print ... you do need to issue a plot command prior to  
printing, but you've already done that (you got gnuplot errors, but  
the command was given and octave created the graphics objects). You  
can suppress the warnings by turning off the figure's visibility.

	figure (1, "visible", "off")
	plot (1:10)
	priint -dpng test.png

However, if the setenv command above works, you shouldn't have to  
resort to such tricks.

Ben