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
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