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PROD 連乘函數, 階乘可用

PROD Product of elements.
    For vectors, PROD(X) is the product of the elements of X. For
    matrices, PROD(X) is a row vector with the product over each
    column. For N-D arrays, PROD(X) operates on the first
    non-singleton dimension.
 
    PROD(X,DIM) works along the dimension DIM.
 
    Example: If X = [0 1 2
                     3 4 5]
 
    then prod(X,1) is [0 4 10] and prod(X,2) is [ 0
                                                 60]
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