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Function for summing an infinite series using for-end loops

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Chris
Chris 2013-10-28
评论： Youssef Khmou 2013-10-28
The assignment I have is to create a MATLAB function that calculates the value of a function of x as defined as f(x) = (x^2)/37 + (x^3)/3! + (x^4)/4! + (x^5) +.... and test it with a few sets of data for the x value and nth order in which to evaluate. I have created a function, and yet when I try to evaluate it, the output keeps equaling zero for anything I put in there. I'm not completely sure what I'm doing wrong.
Here's the code for the function:
function [x,n]=my_fun(x,n)
x=zeros(size(x));
S=(x^2)/37;
for ii=3:n
S=S+((x^ii)/factorial(ii));
end
end
And here's the code for when I try to use inputs:
x=.25;
n=4;
my_fun(x,n)
Any help would be greatly appreciated. I understand what the program is trying to do, it's just the syntax is a little confusing for me at the moment.

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回答（1 个）

Youssef Khmou
Youssef Khmou 2013-10-28
Chris,
You can start by differentiating between names of input and output variables , then only S is your output :
function [S]=my_fun(x,n)
S=(x^2)/37;
for ii=3:n
S=S+((x^ii)/factorial(ii));
end
end
  2 个评论
Chris
Chris 2013-10-28
Thank you very much, this helped a lot...was making it a lot harder than it actually was.

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