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help size
SIZE   Size of array.  
    D = SIZE(X), for M-by-N matrix X, returns the two-element row vector
    D = [M,N] containing the number of rows and columns in the matrix.
    For N-D arrays, SIZE(X) returns a 1-by-N vector of dimension lengths.
    Trailing singleton dimensions are ignored.

    [M,N] = SIZE(X) for matrix X, returns the number of rows and columns in
    X as separate output variables.
   
    [M1,M2,M3,...,MN] = SIZE(X) for N>1 returns the sizes of the first N
    dimensions of the array X.  If the number of output arguments N does
    not equal NDIMS(X), then for:

    N > NDIMS(X), SIZE returns ones in the "extra" variables, i.e., outputs
                  NDIMS(X)+1 through N.
    N < NDIMS(X), MN contains the product of the sizes of dimensions N
                  through NDIMS(X).

    M = SIZE(X,DIM) returns the length of the dimension specified
    by the scalar DIM.  For example, SIZE(X,1) returns the number
    of rows. If DIM > NDIMS(X), M will be 1.

    When SIZE is applied to a Java array, the number of rows
    returned is the length of the Java array and the number of columns
    is always 1.  When SIZE is applied to a Java array of arrays, the
    result describes only the top level array in the array of arrays.

    Example:
    If
       X = rand(2,3,4);
    then
       d = size(X)              returns  d = [2 3 4]
       [m1,m2,m3,m4] = size(X)  returns  m1 = 2, m2 = 3, m3 = 4, m4 = 1
       [m,n] = size(X)          returns  m = 2, n = 12
       m2 = size(X,2)           returns  m2 = 3

    See also length, ndims, numel.
2Â¥2009-10-14 09:33:41
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