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, so trying to plot my
own zero-line:
p2=line([[-10,0],[10,0]]);
show(p2)
and then trying to plot both graphics:
show(p1+p2)
only now i see correct graphic.
so... is it bug or my mistake (and what can i do to avoid it in
future?)
Sage worksheet:
http://75.75.6.176/home/pub/2/
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