MATLAB Plot Function For Sum of Series Problem

Hey there,

I working on loops and draw some plots on it. When i started to work in sum of series i have found a problem for me. I cant plot what i want to draw. Here is my sum of series function :

and here is my code part :

sum=0;
for k= 1 : 1 : 10
  sum = sum +  ((((-1)^(k+1))+1)*cos(k*pi));
end
result = sum *2
figure(1)
plot(k,result)
end

[Jan]

You forgot to tell us, what you want to draw.

Answer 1

[Torsten]

summe = zeros(11,1)
for k= 1 : 1 : 10
  summe(k+1) = summe(k) +  ((((-1)^(k+1))+1)*cos(k*pi));
end
result = summe *2
figure(1)
plot(0:1:10,result)
end

Answer 2

[Jan]

And another approach:

AxesH = axes('NextPlot', 'add');
s = 0;
for k= 1 : 1 : 10
  s = s + 2 * (((-1)^(k+1)) + 1) * cos(k*pi);
  plot(k, s, 'o');
end

'NextPlot'='add' is equivalent to: hold on.

Plotting a series as a line is questionable, because there is no value except for the natural numbers.

Note: Do not use "sum" as name of a variable, because this causes troubles frequently when a user tries to call the built-in function sum() afterwards. Example:

x = 1:10;
sum(x)
sum = rand(1, 5);
sum(x)