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61 lines
1.5 KiB
Plaintext
61 lines
1.5 KiB
Plaintext
NAME
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sum - sum, or sum of defined sums
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SYNOPSIS
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sum(x_1, x_2, ...)
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TYPES
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x_1, x_2, ... any
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return any
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DESCRIPTION
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If an argument x_i is a list with elements e_1, e_2, ..., e_n, it
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is treated as if x_i were replaced by e_1, e_2, ..., e_n; this may
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continue recurively if any of the e_j is a list.
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If an argument x_i is an object of type xx, then x_i is replaced by
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xx_sum(x_i) if the function xx_sum() has been defined. If the
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type xx has been defined by:
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obj xx = {x, y, z},
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an appropriate definition of xx_sum(a) is sometimes a.x + a.y + a.z.
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sum(a) then returns the sum of the elements of a.
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If x_i has the null value, it is ignored. Thus, sum(a, , b, , c)
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will return the same as sum(a, b, c).
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Assuming the above replacements, and that the x_1, x_2, ..., are
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of types for which addition is defined, sum(x_1, x_2, ...) returns
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the sum of the arguments.
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EXAMPLE
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> print sum(2), sum(5, 3, 7, 2, 9), sum(3.2, -0.5, 8.7, -1.2, 2.5)
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2 26 12.7
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> print sum(list(3,5), 7, list(6, list(7,8), 2))
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38
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> obj point {x, y}
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> define point_add(a,b) = obj point = {a.x + b.x, a.y + b.y}
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> obj point A = {1, 5}
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> obj point B = {1, 4}
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> obj point C = {3, 3}
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> print sum(A, B, C)
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obj point {5, 12}
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> define point_sum(a) = a.x
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> print sum(A, B, C)
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5
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LIMITS
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The number of arguments is not to exceed 100.
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LIBRARY
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NUMBER *qmin(NUMBER *x1, NUMBER *x2)
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SEE ALSO
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max, obj
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