Question

我有一个关于使用for循环从向量创建矩阵的简单问题，例如

A = [1:101]; 

matrix = [1   2   3   4  ... 50;
          51  52  53  54 ... 100;
          101 1   2   4  ... 49;
          50  51  52  53 ... 100]

有人可以告诉我该怎么做吗？非常感谢

Answer 1

我假设除了A之外，你还有matrix的行数和列数作为输入，即

A = 1:101;
nRows = 4;
nCols = 50;

试试这个：

% initialize
matrix = zeros(nCols, nRows); % create it transposed because we'll have to transpose it later because MATLAB is column-major

%figure out how many times we will have to repeat A
nRepeat = ceil(numel(matrix)/numel(A));

% Tile A
A_tiled = repmat(A, 1, nRepeat);

%fill in matrix
matrix(1:end) = A_tiled(1:numel(matrix));

%Finally, transpose
matrix = matrix';

返回

matrix = [1   2   3   4  ... 50;
          51  52  53  54 ... 100;
          101 1   2   4  ... 49;
          50  51  52  53 ... 99]

尽可能接近

Answer 2

它需要使用循环吗？

A= [1 2 3 4 ... 1000];
numberOfColumns = 3;
[matrix,padded] = vec2mat(A,numberOfColumns)

输出：

  1       2        3
  .       .        .
 998     999     1000

使用for循环从向量创建矩阵？

2 个答案: