Create a matrix with a for loop

Question

Colin Lynch 2018-2-11

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/381969-create-a-matrix-with-a-for-loop

评论： Star Strider 2018-2-11

Hey there!

I am attempting to create a matrix which has n, s, k, and i as columns. However, I keep getting this error no matter how I try to make the matrix:

Subscript indices must either be real positive integers or logicals.

Is there a way around this problem considering that I need to make a list that comprises of numbers that aren't positive integers?

 for i = -3:.5:2 
    k = 10^i;
    n = (100 / k);
    s = sqrt((-.5^2 .* ((100 / k)-(.5.*(100 / k)))./(100-(100 / k)))./((((100 / k)-(.5.*(100 / k)))./(100-(100 / k)))-1));
    if (0<s) && (s<=1) 
        s = s;
    elseif s > 1 || (isnan(s)==1)
        s = 1;
    elseif isreal(s) == 1
        s = 0;
    else
        s = 0;
    end
    RTIlogk{i} = [i k n s]; 
end

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Answer 1

Star Strider 2018-2-11

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/381969-create-a-matrix-with-a-for-loop#answer_304526

在 MATLAB Online 中打开

Yes. Create a vector from your original ‘i’, then refer to it by subscript.

This works:

iv = -3:.5:2;
for i = 1:numel(iv)
    k = 10^iv(i);
    n = (100 / k);
    s = sqrt((-.5^2 .* ((100 / k)-(.5.*(100 / k)))./(100-(100 / k)))./((((100 / k)-(.5.*(100 / k)))./(100-(100 / k)))-1));
    if (0<s) && (s<=1)
        s = s;
    elseif s > 1 || (isnan(s)==1)
        s = 1;
    elseif isreal(s) == 1
        s = 0;
    else
        s = 0;
    end
    RTIlogk{i} = [i k n s];
end