如何在MATLAB中将单元格数组中不同大小的行和列组合成矩阵

Question

如何有效地将不同大小的array v row和Column单元格合并到matrix中，用0填充向量？ 例如，如果我有

A= {[1;2;3]  [1 2 ; 1 3; 2 3]  [1 2 3]};

我想要得到：

A=[1 0 0
   2 0 0
   3 0 0
   1 2 0
   1 3 0
   2 3 0
   1 2 3]

Answer 1

您可以使用padarray在vertcat之前用零填充数组：

  B = padarray(A{1},[0 3-size(A{1},2)],'post')
  C = padarray(A{2},[0 3-size(A{2},2)],'post')
  D = padarray(A{3},[0 3-size(A{3},2)],'post')
  %//Note the 3-size(A{1},2)... The 3 comes from the number of columns you want your final matrix to be, and it cannot be smaller than the maximum value of size(A{N},2) in your case it is 3, since A{3} is 3 columns wide. 
  result = vertcat (B,C,D)

  result =

     1     0     0
     2     0     0
     3     0     0
     1     2     0
     1     3     0
     2     3     0
     1     2     3

你可以写一个循环遍历你的单元格或使用cellfun进行并行化。

在一个简单的循环中，它看起来像：

 result = [];
 for t = 1:size(A,2)
    B = padarray(A{t},[0 3-size(A{t},2)],'post');
    result = vertcat(result,B);
 end