convert matrix in single column

354 次查看（过去 30 天）

Gaetano Sciacovelli 2012-4-18

5
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/35811-convert-matrix-in-single-column

编辑： Image Analyst 2022-7-14

Hi, I have to convert a matrix in one column vector composed of all the columns of the original matrix. How can I do this? Thanks

5 个评论
显示 3更早的评论隐藏 3更早的评论

Ndilokelwa Luis 2018-8-27

Transpose matrix first!

Image Analyst 2020-4-9

You said "I have to convert a matrix in one column vector composed of all the columns of the original matrix." I thought you meant you had a column vector and had to convert it to a matrix having the same number of columns as the original matrix from where the column vector came. In other words, I thought you meant "I have to convert a matrix of one column vector INTO ONE composed of all the columns of the original matrix."

Seeing the answer you accepted, it appears that you actually meant "I have to convert a matrix INTO a one column vector that is composed of all the columns of the original matrix." Leaving out seemingly minor words completely changes the interpretation of the question, as does their placement in the sentence.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Andrei Bobrov 2012-4-18

72
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/35811-convert-matrix-in-single-column#answer_44828

在 MATLAB Online 中打开

yourvector = yourmatrix(:);

10 个评论
显示 8更早的评论隐藏 8更早的评论

rishika yadav 2022-7-14

HOW WE RESHAPE THE MATRIX WITH DIFFERENT ROW NO, AND SAME COLUMBS

Image Analyst 2022-7-14

编辑：Image Analyst 2022-7-14

在 MATLAB Online 中打开

@rishika yadav you can use interp2 to interpolate a different height:

m = reshape(1:18, [], 3) % Create 6 row by 3 column sample data
[oldHeight, columns] = size(m)
% Make the matrix taller by interpolating.
newHeight = 8;
[xq,yq] = meshgrid(1:columns, linspace(1, oldHeight, newHeight));
mTaller = interp2(m, xq, yq)
fprintf('The size of mTaller is %d rows by %d columns.\n\n', size(mTaller, 1), size(mTaller, 2))
% Make the matrix taller by interpolating.
newHeight = 3;
[xq,yq] = meshgrid(1:columns, linspace(1, oldHeight, newHeight));
mShorter = interp2(m, xq, yq)
fprintf('The size of mShorter is %d rows by %d columns.\n', size(mShorter, 1), size(mShorter, 2))

The first/top and last/bottom rows will have the same values, and more, or fewer, rows will be interpolated in between the top row and bottom row so that you have your new desired height.

请先登录，再进行评论。

更多回答（4 个）

Kyril Kaufmann 2020-4-26

4
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/35811-convert-matrix-in-single-column#answer_428507

在 MATLAB Online 中打开

For a more algorithmic solution:

% From matrix to vector
N   = 10;
mat1 = rand(N);
vec1 = zeros(N*N,1);
for i=1:N
    for j=1:N
        vec1((i-1)*N + j) = mat1(i,j);
    end
end
% From vector to matrix
N   = 10;
vec2 = rand(N*N,1);
mat2 = zeros(N);
for i=1:N
    for j=1:N
        mat2(i,j) = vec2((i-1)*N + j);
    end
end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Image Analyst 2012-4-18

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/35811-convert-matrix-in-single-column#answer_44825

在 MATLAB Online 中打开

If your column vector was "composed of all the columns of the original matrix", then use the reshape() command to turn it from a column vector back into the original 2D matrix.

matrix2D = reshape(columnVector, [rows columns]);

(The converse, how to get the column vector in the first place (what you may have done to get your vector) is accomplished like this columnVector = fullMatrix(:).)