How to write a for loop for summation?

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jake stan
jake stan 2018-2-6
回答： Walter Roberson 2018-2-6
Is there another way to do summation without for loop, or how would I do it with a for loop?
I want to iterate from N = 1 to N = 25 with 0 < x < 2*pi of the equation n*(sin^2(x)+cos^2(x)) I'm not so sure how to do a for loop for the summation

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Birdman
Birdman 2018-2-6
Do not use for loop. If you Symbolic Toolbox, you may use symsum:
syms x n
fun(x)=symsum(n*(sin(x)^2+cos(x)^2),n,1,25)

更多回答（1 个）

Walter Roberson
Walter Roberson 2018-2-6
Use sum().
sin(x)^2 + cos(x)^2 = 1, even for complex numbers, so n*(sin(x)^2 + cos(x)^2) is going to simplify to n.

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