How to search an compare two arrays for certain criteria

Question

Barnabas 2014-1-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/111309-how-to-search-an-compare-two-arrays-for-certain-criteria

编辑： Barnabas 2014-1-3

I have to arrays that are the same length with similar but not identical values. I need to compare from start to finish these arrays to see when array A is greater than or less than array B by 10% +/- 20. Once I find when those instance occur I need to plot data points 5 seconds before and 5 seconds after the event. Should I use an if and statement loop? Any help is appreciated, thanks.

2 个评论
显示无隐藏无

Azzi Abdelmalek 2014-1-3

This is not clear, give a numeric example and post the expected result

Barnabas 2014-1-3

编辑：Barnabas 2014-1-3

在 MATLAB Online 中打开

Apologies, here is an example below:

A = [100 115 200]

B = [111 105 150]

I need to compare A(1) with B(1) and see if they are within 10% +/- 20. If the difference is greater than 10% +/- 20 then I need to mark that index position, and plot 5 data-points before and after the event.

So I would like a new array that would populate at what index points (in this case A(3)) the difference is greater than 10% +/- 20. I hope that helps. Below is what I have o far, but am not confident in the for loop statements accuracy.

TqRspns = rot90(EngTrqStatic);

TqRqst = (EngTrq_Rq_ESC);

% P = Percent Difference Requested for sort %

P = 10;

% PM = Plus/Minus Nm value for secondary sort %

PM = 20;

n = 1;

    TqRqst1 = (interp1(TqRqst,1:0.50032725075316337285902503293808:126077));
    Difference = abs(((TqRspns./TqRqst1)*100)-100);
    index = find(Difference>P);
    for n = 1:251988;
            if (TqRqst1(n)>TqRspns(n)+PM);
                Found(n) = n;
                n+1;
            end;
    end;

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2014-1-3

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/111309-how-to-search-an-compare-two-arrays-for-certain-criteria#answer_119962

在 MATLAB Online 中打开

mask = (A > 0.9 * B - 20) & (A < 1.1 * B + 20);
extended_mask = logical(filter(mask, ones(1,11)));

Now extended_mask selects the elements to be plotted. How to proceed with the actual plotting depends on what you want the output to look like when there are multiple events.