How can I create a for loop inside another for loop for a geometric series?

Question

Amy 2014-2-28

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https://ww2.mathworks.cn/matlabcentral/answers/119556-how-can-i-create-a-for-loop-inside-another-for-loop-for-a-geometric-series

评论： Amy 2014-3-10

I have the following code so far:

    %alphaSum.m
    %
    %
    %Amy Wallace, 19/02/2014
    %Variable dictionary
    %N Number of terms to sum
    %alpha Sum of geometric series
    %x vector of constants
    %n Loop counter
    N = input('Enter the number of terms to sum: ');
    alpha = 0;
    x = [0.9 0.99 0.999 0.9999 0.99999 0.999999 0.9999999];
    for n = 0:N-1
        alpha = alpha + (x.^(n));
    end
    format long
    alpha

This allows the user when the script is ran in the command window to enter one term of N to sum. I was wondering, if by using nested looping I could possibly use multiple N terms to sum at the one time? I have already tried calling N as a string with no luck. Thanks

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Answer 1

Mischa Kim 2014-2-28

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https://ww2.mathworks.cn/matlabcentral/answers/119556-how-can-i-create-a-for-loop-inside-another-for-loop-for-a-geometric-series#answer_126554

编辑：Mischa Kim 2014-2-28

在 MATLAB Online 中打开

Amy, check out

Nin = inputdlg('Enter space-separated numbers:', 'N vector', [1 50]);
N   = str2num(Nin{:});
x   = [0.9 0.99 0.999 0.9999 0.99999 0.999999 0.9999999];
alpha = zeros(length(N), length(x));
for ii = 1:length(N)
    for n = 0:N(ii)-1
        alpha(ii,:) = alpha(ii,:) + (x.^(n));
    end
end