Check if condition happened in previous values

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!

Answer 1

[DGM]

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