Re: 2 variables on same plot?

[Martin Schultz <martin.schultz(at)dkrz.de>]

Cathy Smith wrote:
> 
> Hi all,
> 
> How do I plot 2 variables on 1 plot? They each have vastly
> different ranges. I believe I am supposed to use AXIS but I can't seem
> to get the 2nd plot to be scaled correctly.
> 
> xt=indgen(365)
> plot,xt(0:90),omega(0:90),xstyle=8,ystyle=8
> axis,yrange=[0,11],ystyle=1,/save,yaxis=1,xaxis=0
> oplot,xt(0:90),prate(0:90),linestyle=2
> 
> The 2nd y axis has values from 0 to 10 and the data ranges from 0 to 10
> but it is plotted from 0 to .001 or something like that.
> 
> thanks
> Cathy Smith
> 
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Can't see anything wrong with your code (except for using () instead
of [] for array indexing). The procedure below does what it should, I
think. Try a statement like

print, min(prate(0:90),max=mm),mm

to see what your data range is really like.

In the future: please post code examples that work by cut&paste - th
eeasier it is for people to try out your code, the more likely will
you get an answer.

Cheers,

Martin




PRO second_axis


   ;; create dummy data
   xt=indgen(365)
   omega = sin(!DTOR*xt)
   prate = 10.*cos(4.*!DTOR*xt)*cos(4.*!DTOR*xt)*exp(-xt/100.)

   ;; plot
   plot,xt[0:90],omega[0:90],xstyle=8,ystyle=8
   axis,yrange=[0,11],ystyle=1,/save,yaxis=1,xaxis=0
   oplot,xt[0:90],prate[0:90],linestyle=2


END

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[[ Dr. Martin Schultz   Max-Planck-Institut fuer Meteorologie    [[
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[[ martin.schultz@dkrz.de                                        [[
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