how to delete adjacent entries from an array
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Hallo,
I have a long column vector A (say 30000x1) with values 1 to 100 and I want not only to delete all entries equal to the number 60 (which I can do with B= A(A~=60), but all 50 elements immediately next to 60 (previous and next, in total 100). The elements in A are randomly positioned , so some times the deleted values may 'overlap'. Do you know how I can do this?
Thank you
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채택된 답변
Jos (10584)
2014년 2월 13일
Let N be the number of items that is to be removed before and after the locations of the value V in A. (so there are 2*N+1 items to be removed for non-overlapping regions)
A = [10 9 9 999 9 9 11 12 9 9 999 9 999 9 9 13 14]
V = 999
n = 2
% all elements 999 are to be removed, as well as the adjacent two elements before
% and after it (i.e., the 9's in the example array A above)
tf = logical(conv(double(A==V),ones(1,2*n+1),'same'))
A(tf) = []
추가 답변 (1개)
Andrei Bobrov
2014년 2월 13일
편집: Andrei Bobrov
2014년 2월 13일
ii = unique(bsxfun(@plus,find(A == 60),[-1 0 1]));
out = A;
out(ii(ii > 0 & ii <= numel(A))) = [];
way with Image Processing Toolbox
out = A(imerode(A ~= 60,[1;1;1]));
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