Re: grid outside border

[Daniel J S. <dan...@ie...>]

OK, I think I have narrowed this down.  It has to do with the xrange 
being slightly less than a whole number.  You may or may not feel this 
is gnuplot's problem or Octave should be worrying about this.  I'll just 
describe it.

Launch gnuplot with the -nofeedback option.  Then type the following set 
of commands:

set xrange [0:1.99805]
set grid
plot sin(x)
set xrange [0:2]     
replot
set xrange [0:1.99805]
replot

You should notice this behavior on the right border toggling back and 
forth.  So, yes it does seem that the border is being drawn a pixel to 
the left because of the 1.99805.  So I guess the question is whether a 
grid line should be drawn at all in this scenario.  It probably has 
something to do with rounding.

If you run gnuplot without the -nofeedback option, the feedback will 
slightly readjust the x length and the rounding will behave differently. 
 But if you move your x-window about a bit, in some locations you should 
see the right border shifted slightly to the left.  I guess what I'm 
saying is that on your particular system, if you run "gnuplot 
-nofeedback" and then

set xrange [0:1.99805]
set grid
set term png
set output 'junk.png'
plot sin(x)
set output

You should get a PNG file with the aberration.  Your X11 system may 
behave slightly different depending upon your system settings.

Unless someone wants to tackle this now, I think in the next couple days 
I'll put it in SourceForge bug list along with a couple other items 
before I forget them.

Dan