| Re: Help, somebody! Error Bars in both X and Y directions. [message #1505] |
Fri, 03 December 1993 07:32 |
thompson
Messages: 584
Registered: August 1991
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Senior Member |
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shah@spot.Colorado.EDU (SSS) writes:
> Hello there,
> I have been fruitlessly trying to implement an IDL code to
> create errorbars in both x and y directions. However, my data
> on the ordinate (y axis) is at a very different range than the abcissae
> (x axis). For example, xrange=[0.75,1.25]; yrange=[0.01,0.05]. The
> following procedure, obviously wrong, is able to produce the
> correct x,y mapping but, alas, the errorbars do not correspond to
> their respective x and y scales.
> Can a kind soul help me in this adventure? Oh, I would
> appreciate a non-widget solution. Both, pwidget of RSI and
> pubplot of Joel Offenberg were unable to run on my Solaris
> machine because of some problem. And, no time to spare...
(rest deleted)
I think your mistake is in trying to use USERSYM to accomplish what you want to
do. You'd be better off just using OPLOT with PSYM=0, e.g.
for i=0,9 do begin
xx= x(i) + [1,-1]*xerrbar(i) ;x-coordinates
yy= y(i) + [1,-1]*yerrbar(i) ;y-coordinates
oplot, xx, y(i), psym=0, linestyle=0
oplot, x(i), yy, psym=0, linestyle=0
xyouts, x(i), y(i), xytitle(i)
endfor
It should also work with PLOTS instead of OPLOT, if you prefer.
Bill Thompson
P.S. You might prefer to adjust the minimum and maximum values to include the
error bars, e.g.
xmin=min(x-xerrbar) & xmax=max(x+xerrbar)
ymin=min(y-yerrbar) & ymax=max(y+yerrbar)
plot, x, y,/nodata, xrange=[xmin,xmax],yrange=[ymin,ymax]
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