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how to use sum?

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George
George 2013-2-18
I am trying to use sum but with no success!
For example:
n=1:20;
sum(n./2.^n)
or:
n=20;
k=1:n;
sum(k);
but neither works!Am I missing sth here?
Thanks!
  1 个评论
Jan
Jan 2013-2-18
"Neither works" is not a good description of the problem. Better post the error message of explain the difference between the results and your expectations.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-2-18
编辑：Azzi Abdelmalek 2013-2-18
%They both work fine
%What is your error message?
%Try
clear sum
n=1:20;
sum(n./2.^n)
Mybe sum is used as a variable in your code
  2 个评论
George
George 2013-2-18
Ok!It wanted clear all!Maybe it messed up with something!!And I was going crazy!
Jan
Jan 2013-2-18
No, Georg, not clear all, but clear sum. See Answers: avoid clear all. But instead of clearing variables, it is much better to avoid using the names of built-in functions as names of variables.

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