store data in an array

Question

ignacio bobadilla tapia 2021-6-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/847315-store-data-in-an-array

评论： Walter Roberson 2021-6-4

Along with saying hello, I need help storing information. I did a for loop so that it was storing data, but when dt = [] is not stored, also if you could help me that when it happens that dt = [], the threshold value is 1.5, it would be 0 and thus not have the error that dt was an empty set, in short, that when dt = [], the threshold is 0 so that I can calculate the loop and also store it in the dt matrix.

Thanks greetings.

I attach .txt with the data, a function and the code I leave it copied in the questions panel.

close all, clear all, clc
amplitude=load('amplitude.txt');
x=0:10:4*3600;
threshold = 1.5; 
for j=1:7
        y=amplitude(:,j);
        [val,ind] = max(y);
        x_peak = x(ind);
        [t0_pos,s0_pos,t0_neg,s0_neg]= crossing_V7(y,x,threshold,'linear');
        [minValue, closestIndex1] = min(abs(t0_pos - x_peak));
        closestValue_pos = t0_pos(closestIndex1);
        [minValue, closestIndex2] = min(abs(t0_neg - x_peak));
        closestValue_neg = t0_neg(closestIndex2);
        dt = abs(closestValue_neg - closestValue_pos)./60
end

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Answer 1

Walter Roberson 2021-6-3

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/847315-store-data-in-an-array#answer_716210

在 MATLAB Online 中打开

amplitude=load('amplitude.txt');
x=0:10:4*3600;
threshold = 1.5; 
cols = size(amplitude,2);
all_dt = zeros(1,cols);
for j=1:cols
        y=amplitude(:,j);
        [val,ind] = max(y);
        x_peak = x(ind);
        [t0_pos,s0_pos,t0_neg,s0_neg]= crossing_V7(y,x,threshold,'linear');
        [minValue, closestIndex1] = min(abs(t0_pos - x_peak));
        closestValue_pos = t0_pos(closestIndex1);
        [minValue, closestIndex2] = min(abs(t0_neg - x_peak));
        closestValue_neg = t0_neg(closestIndex2);
        dt = abs(closestValue_neg - closestValue_pos)./60;
        if isempty(dt); dt = 0; end
        all_dt(j) = dt;
end

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ignacio bobadilla tapia 2021-6-3

It executes the code, but I get an empty set in the results of the code.

Walter Roberson 2021-6-4

The only way that code can return empty is if the loaded amplitude is empty. In such a case,, cols would come out as 0 and all_dt would be a 1 x 0 matrix.

In all other cases, the result in all_dt could potentially turn out all 0, but cannot turn out empty.

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