1樓:匿名使用者
repmat是將矩陣按要求擴增。 repmat([1:n]',[1,2])):就是將[1:n]'看成一個整體,就相當於一個元素,將這個大的「元素」
擴增為1x2的矩陣,如果p是整數,則就是將1x2矩陣p倍輸出,即三維擴增。以下是matlab的help結果:
repmat replicate and tile an array.
b = repmat(a,m,n) creates a large matrix b consisting of an m-by-n
tiling of copies of a. the size of b is [size(a,1)*m, size(a,2)*n].
the statement repmat(a,n) creates an n-by-n tiling.
b = repmat(a,[m n]) ac***plishes the same result as repmat(a,m,n).
b = repmat(a,[m n p ...]) tiles the array a to produce a
multidimensional array b ***posed of copies of a. the size of b is
[size(a,1)*m, size(a,2)*n, size(a,3)*p, ...].
repmat(a,m,n) when a is a scalar is ***monly used to produce an m-by-n
matrix filled with a's value and having a's class. for certain values,
you may achieve the same results using other functions. namely,
repmat(nan,m,n) is the same as nan(m,n)
repmat(single(inf),m,n) is the same as inf(m,n,'single')
repmat(int8(0),m,n) is the same as zeros(m,n,'int8')
repmat(uint32(1),m,n) is the same as ones(m,n,'uint32')
repmat(eps,m,n) is the same as eps(ones(m,n))
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這個命令就是從矩陣i中取出一個n階行列式,就是到i的第1行到第n行加上第1行到第n列的資料。下面是一個例子 a rand 4,5 產生隨機陣列,每次執行結果不一定相同 i 4 b a 1 i,1 i 結果為 a 0.6557 0.6787 0.6555 0.2769 0.6948 0.0357 0....
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