Check if condition happened in previous values

Question

Alex Regner 2022-2-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1649910-check-if-condition-happened-in-previous-values

编辑： DGM 2022-2-15

cctbbo = 100.*(Close + 2.*movstd(Close,[BBOlength 0]) - movavg(Close, 'simple', BBOMAlength ))./(4 .*movstd(Close,[BBOlength 0]));

BBobline = 80;

BBosline = 20;

sl1 = cctbbo < BBosline;

Basically I need to check if sl1 is true for any of the previous 20 values at any point in the vector Close. Pretty new to MatLab so I'd appreciate the help. Thanks!

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Answer 1

DGM 2022-2-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1649910-check-if-condition-happened-in-previous-values#answer_896265

编辑：DGM 2022-2-15

在 MATLAB Online 中打开

Consider the simplified example:

cctbbo = randi([10 99],1,40);
BBosline = 20;
sl1 = cctbbo < BBosline; % some logical vector
wsize = 5; % shorter window for demonstration
sl2 = imdilate(sl1,[zeros(1,wsize+1) ones(1,wsize)]); % offset moving maximum filter
[sl1; sl2] % compare input and output
ans = 2×40 logical array
   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   1   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   0   0   0   0   0   1   1   1   1   1   0   0   0   1   1   1   1   1   0   1   1   1   1   1   0   0   0   0   0   0   0   0   0