如何通過對每個元素的索引應用一個函數來在MATLAB中創建一個數組？

Question

我在尋找類似於matrix(m, n, f), but for MATLAB rather than MuPAD, and for arrays rather than matrices的東西。也就是說，我在尋找這樣做沒有的（氮高效）的方式for循環：

ret = zeros(m, n); 
for i = 1:m 
    for j = 1:n 
     ret(i, j) = some_function([i, j]); 
    end 
end 

Answer 1

你可以用bsxfun做到這一點，anonymous functions：

m = 5; n = 5;      %// matrix size 
f = @(i,j) i*j;     %// anonymous function to apply to each array element 
ret = bsxfun(f,(1:m)',1:n);  %'//apply bsxfun and get output 

---

輸出例如：

ret = 

    1  2  3  4  5 
    2  4  6  8 10 
    3  6  9 12 15 
    4  8 12 16 20 
    5 10 15 20 25