On Sep 9, 1:29 am, Jason Merrill <[EMAIL PROTECTED]> wrote:
> On Sep 8, 4:12 pm, Sand Wraith <[EMAIL PROTECTED]> wrote:
>
>
>
> > Hi all!
>
> > I do not know - it is an bug, or my mistake. I am trying to plot sum
> > of a few same functions:
>
> > This is my function:
> > B=10*sqrt( pi)/7;
> > b=pi/7;
> > c(f)=B*exp(-(b*f)^2);
> > plot(c(f),(f,-5,5));
>
> > in the output i see correct graphic.
>
> > Then i have define a function to calculate sum:
>
> > def specsum(x,Fdesc):
> > result=0;
> > for i in range(-2,3):
> > xi=i*Fdesc;
> > result+=c(x-xi);
> > return result;
>
> > then plotting...
>
> > p1=plot(specsum(x,5),(x,-2.5,2.5));
>
> > show(p1)
>
> > i see graphic, and i think its wrong, because then x -3..-1 it cross
> > the X-Axis. then i thought that it is wrong axis, ...
>
> This graphic is fine. It's just that the horizontal axis is not at
> y==0, which you can see by reading the values off of the y axis. You
> can do
>
> sage: show(p1,ymin=0)
>
> if you want the horizontal axis drawn at y==0. There may be a way to
> set the position of the axes origin more directly. If not, maybe
> there should be.
>
> Regards,
>
> JM
Thank you!!
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