Hello,
I'd like to plot this function of x (latex code):
x/2 + sum_{r=1}^n cos(rx)
for some fixed n.
//A//
First, sum is designed for formal sum, not for truncate sum even if
sometimes it's possible.
But add is designed for these sums.
Second, expression doesn't evaluate the add(...) function.
Third, I think you want to change n0...
So I propose a function s (in Python), not a function coming from
expression.
k = var('k');
def s(x,n) :
return x/2 + add (cos(k*x) for k in [1..n])
n0 = 5;
plot(s(x,n0),(x,0,pi))
//B//
You use Sage, not Maple. You must forget semicolon at the end.
//C//
After var('n'), it seems that your code is right in the last Sage.
But I remain very careful about sum in order to get a1+a2+a3+...+a50.
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