How to iterate a for loop starting from the previous element?

Question

Enrica Brunetti 2020-9-17

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https://ww2.mathworks.cn/matlabcentral/answers/595261-how-to-iterate-a-for-loop-starting-from-the-previous-element

回答： Gaurav Garg 2020-9-21

I want to plot this signal (inv_norm) within this range [o_previous; o]. I have tried to use these lines code, but I have this error ( "Array indices must be positive integers or logical values"), because Matlab doesn't count from 0.

for i= 1 : length(times_2r)
        ind33 = times_2r(i);
        o = find(times_biceps == ind33);
        o_previous = find(times_biceps == times_2r(i-1));
        inv = inv_norm(o_previous:o);
        figure;
        plot(inv);
    end

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Answer 1

Gaurav Garg 2020-9-21

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https://ww2.mathworks.cn/matlabcentral/answers/595261-how-to-iterate-a-for-loop-starting-from-the-previous-element#answer_497866

Hi Enrica,

You should recheck lines 3 and 4 (o = find(times_biceps == ind33); o_previous = find(times_biceps == times_2r(i-1));). The documentation tells that output of find function is a matrix. However, array indices can only be positive and logical values.

So, I would recommend you to rewrite the lines 3 and 4, or rewrite line 5 to run over a loop for each value in o_previous and o.