Vectorizing a for loop

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end

I need to vectorize this for loop, but i am having trouble. so far I have this. I do not understand what I am doing wrong. I understand the concept of what I am trying to do, but having trouble applying it.

    ni = 8;
    k=2:9;
    j=[];
    y=[];
    y(1) = 12 + 6*cos(0);
    j =cumsum((k-1)*((20)/ni));
    y(k) = 12 + 6*cos(2*pi.*j./20);

any help would be greatly appreciated.

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Matt J 2014-11-28

编辑：Matt J 2014-11-28

any help would be greatly appreciated.

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Brian 2014-11-28

thank you. First time using the forums.

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Answer 1

Guillaume 2014-11-28

编辑：Guillaume 2014-11-28

在 MATLAB Online 中打开

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You're overcomplicating. I'm not sure what you're trying to do with cumsum

tstart = 0;
tend = 20;
ni = 8;
t = linspace(tstart, tend, ni+1);
y = 12 + 6*cos(2*pi*t/(tend-tstart)); %same expression as original with the index

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Brian 2014-11-28

ahh thank you. I was actually misunderstanding what the variable "t"'s function was in the program. This clears it up for me. Thank you again.

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