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2013.12.31

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repmat是將矩陣按要求擴(kuò)增。 repmat([1:N]',[1,2]))：就是將[1:N]'看成一個(gè)整體，就相當(dāng)于一個(gè)元素，將這個(gè)大的“元素”擴(kuò)增為1x2的矩陣，如果p是整數(shù)，則就是將1x2矩陣p倍輸出，即三維擴(kuò)增。以下是Matlab的help結(jié)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]) accomplishes the same result as repmat(A,M,N). B = REPMAT(A,[M N P ...]) tiles the array A to produce a multidimensional array B composed 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 commonly 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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