Gnuplot documentation mentions crossbars at the ends of an error bar,
but I can't find anywhere where it mentions the midpoint marking.  I
had to plot errorbars twice for the same plot command, once in black
and once in red.  Changing colors was the easy part.  What I
discovered is that gnuplot uses different markers to mark the
midpoints of error bars.  For the first set of error bars I got a
small crossbar as the midpoint marker.  For the second set of error
bars, the midpoint marker was an "X", but I want the same midpoint
marker for both sets (namely, the small crossbar).  Is there any way
to specify that?  I tried using "pointtype 1" but got the message
"duplicated or contradicting arguments in plot options."

Thanks,

Mike

mikegnubie wrote:

> Gnuplot documentation mentions crossbars at the ends of an error bar,
> but I can't find anywhere where it mentions the midpoint marking.

I am not aware of any such thing as a "midpoint mark".
Could you please provide the command you used?


> I had to plot errorbars twice for the same plot command, once in black
> and once in red.  Changing colors was the easy part.  What I
> discovered is that gnuplot uses different markers to mark the
> midpoints of error bars.  For the first set of error bars I got a
> small crossbar as the midpoint marker.  For the second set of error
> bars, the midpoint marker was an "X", but I want the same midpoint
> marker for both sets (namely, the small crossbar).  Is there any way
> to specify that?  I tried using "pointtype 1" but got the message
> "duplicated or contradicting arguments in plot options."

Ah, so it is indeed the point you are seeing, not anything to do
with the errorbar. "pointtype 1" is indeed the correct option.
If you got an error message, it must be for something elsewhere in
your plot command.   When you report a problem, it is always best
to show the actual command that you used.

        Ethan


> Thanks,
> 
> Mike