searching for vector values in a matrix

Question

Ahmed Alnahdi 2015-4-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/214029-searching-for-vector-values-in-a-matrix

评论： Ahmed Alnahdi 2015-4-28

采纳的回答： Mohammad Abouali

Hi, I have a vector with 3 specific values and I want to find their indices in a matrix.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

James Tursa 2015-4-28

What are the dimensions of the matrix? Do the values have to be next to each other in the same row or column?

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Mohammad Abouali 2015-4-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/214029-searching-for-vector-values-in-a-matrix#answer_177042

编辑：Mohammad Abouali 2015-4-28

在 MATLAB Online 中打开

% Creating a sample matrix
yourMatrix=reshape(1:15,5,3)
yourMatrix =
       1     6    11
       2     7    12
       3     8    13
       4     9    14
       5    10    15
% Creating a sample vector with three values.
yourVector=[1,7,14];
% Now getting the row and cols of those values.
[rows, cols]=ind2sub( size(yourMatrix), ...
                      arrayfun(@(v) find(yourMatrix==v), ...
                               yourVector(:)) )
rows =
       1
       2
       4
cols =
       1
       2
       3

The rows and cols of 1,7,14 (the three specific values) are provided. If you are looking only for linear index number then just run:

linIndex=arrayfun(@(v) find(yourMatrix==v), yourVector(:))

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Ahmed Alnahdi 2015-4-28

ماتقصر :)

请先登录，再进行评论。

Answer 2

Image Analyst 2015-4-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/214029-searching-for-vector-values-in-a-matrix#answer_177033

在 MATLAB Online 中打开

If yourVector is an integer valued vector or a floating point vector with values that are multiples or divisors of 2, then try

firstIndex = find(yourVector == firstSpecificValue);
secondIndex = find(yourVector == secondSpecificValue);
thirdIndex = find(yourVector == thirdSpecificValue);