在MATLAB中的向量中添加围绕一个值的其他值的其他值

问题描述

鉴于MATLAB中的零和一向量，其中零表示时间上的事件，我想在现有零之前和之后添加其他零，以捕获其他变化.

Given a vector of zeros and ones in MATLAB, where the zeros represent an event in time, I would like to add additional ones before and after the existing ones in order to capture additional variation.

示例:我想将[0;0;1;0;0]转换为[0;1*;1;1*;0]，其中1*是新添加的.

Example: I would like to turn [0;0;1;0;0] into [0;1*;1;1*;0] where 1* are newly added ones.

推荐答案

假定A为输入列向量-

%// Find all neighbouring indices with a window of [-1 1] 
%// around the positions/indices of the existing ones
neigh_idx = bsxfun(@plus,find(A),[-1 1])

%// Select the valid indices and set them in A to be ones as well
A(neigh_idx(neigh_idx>=1 & neigh_idx<=numel(A))) = 1

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或将Image Processing Toolbox中的 imdilate 与矢量一起使用长度3-

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Or use imdilate from Image Processing Toolbox with a vector kernel of ones of length 3 -

A = imdilate(A,[1;1;1])

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