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Simtel MSDOS - Coast to Coast
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PARTSUM.(X)
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1993-10-16
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472b
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16 lines
# the symbolic partial sum
# to find the symbolic sum of f(x) from x=1 to n
# partsum(n^2, n)
partsum(n_,n_) := n*(n+1)/2
partsum(n_^2,n_) := n*(n+1)*(2*n+1)/6
partsum(n_^3,n_) := n^2*(n+1)^2/4
partsum((-1)^(n_-1)*n_^2,n_) := (-1)^(n-1)*n*(n+1)/2
partsum(2*n_,n_) := n*(n+1)
partsum(2*n_-1,n_) := n^2
partsum((2*n_-1)^2,n_) := n*(4*n^2-1)/3
partsum((2*n_-1)^3,n_) := n^2*(2*n^2-1)
partsum(n_ !*n_, n_) := (n+1)!-1
partsum(n_/(n_+1)!, n_) := 1-1/(n+1)!