To find a vector subset of a matrix in sequence?

Question

Vishal Sharma 2017-1-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/322206-to-find-a-vector-subset-of-a-matrix-in-sequence

评论： Vishal Sharma 2017-1-27

采纳的回答： Thibaut Jacqmin

I have a vector A = [1 2 3] And another matrix B = [2 3 4 1; 1 2 3 4; 2 4 1 3; 2 3 1 4]

I want to know which row of vector A is subset of Matrix B (in same sequence of A, i.e. 1 2 3

The answer is 2nd row of B matrix

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Answer 1

Thibaut Jacqmin 2017-1-27

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/322206-to-find-a-vector-subset-of-a-matrix-in-sequence#answer_252289

在 MATLAB Online 中打开

Here is a solution in one line :

A = [1 2 3];
B = [2 3 4 1; 1 2 3 4; 2 4 1 3; 2 3 1 4];
% Reshape B in a 1D array (all rows in a line)
C = reshape(B', [1, numel(B)]);
% Then use strfind to find a pattern in a string pattern within a string 
linear_index = strfind(C, A);
% Compute the row number of the pattern knowing the initial number of columns 
row_number = ceil(linear_index/size(B, 2));
% Or do it in a single line :
row_number = ceil(strfind(reshape(B', [1, numel(B)]), A)/size(B, 2));