I did miss a step there.


Dave Borncamp
dborncamp@stsci.edu<mailto:dborncamp@stsci.edu>


On Oct 7, 2013, at 5:17 PM, sean-lockwood <notifications@github.com<mailto:notifications@github.com>>
 wrote:


In chapter3.pro:

> @@ -26,11 +29,12 @@ x=findgen(100)/10
>  plot,x,x,xr=[0,10],/nodata,xtitle='x',ytitl='y',title='3.2',charsize=2
>  oplot,x,x,psym=4
>  oplot,x,x^2-x+1,psym=5
> -oplot,x,x^3-x^2+1,psym=8
> +oplot,x,x^3-x^2+1,psym=8  ; Must use usersym first for psym=8


Earlier calls to your histogram program may define this, but your code doesn't. It was undefined when I tried to run it.

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