Matlab：將不同長度的矢量添加到矩陣中

Question

是否可以自動將矩陣中長度不相同的矢量添加到一起？

即：

a = [1 2 3 4] 
b = [1 2] 

我怎樣才能使C爲：

c = [1 2 3 4 ; 1 2 0 0] 

或

c = [1 2 3 4 ; 1 2 NaN NaN] 

或類似的東西

感謝

Answer 1

作出這樣

function out = cat2(a, b) 

    diff = length(a) - length(b) 
    if diff > 0 
     b = [b, nan(1, diff)]; 
    else 
     a = [a, nan(1, -diff)]; 
    end 

    out = [a;b]; 

end 

功能（也可加一個檢查來處理列向量太）

cat2([1 2 3 4], [1 2]) 

ans = 

    1  2  3  4 
    1  2 NaN NaN 

Answer 2

這可能有助於

a = [1 2 3 4]; 
b = [1 2]; 
c = a; 
c(2,1:length(b)) = b; 

c = 

1  2  3  4 
1  2  0  0 

然後，如果你願意寧可有NaN而不是0，你可以做下面的評論Dennis Jaheruddin建議的。