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72 lines
2.1 KiB
Plaintext
72 lines
2.1 KiB
Plaintext
NAME
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max - maximum, or maximum of defined maxima
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SYNOPSIS
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max(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_max(x_i) if the function xx_max() 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_max(a) is sometimes max(a.x, a.y, a.z).
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max(a) then returns the maximum 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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If x_i has the null value, it is ignored. Thus, max(a, , b, , c)
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will return the same as max(a, b, c).
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Assuming the above replacements, and that the x_1, x_2, ..., are
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of sufficently simple ordered types (e.g. real numbers or strings),
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or, if some are objects, the relevant xx_rel(a,b) has been defined
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and returns a real-number value for any comparison that has to be made,
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max(x_1, x_2, ...) returns the value determined by max(x_1) = x_1,
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and succesively for later arguments, by the use of the equivalent of
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max(a,b) = (a < b) ? b : a. If the ordering determined by < is total,
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max(x_1, ...) will be the maximum value among the arguments. For a
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preorder relation it may be one of several maximal values. For
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other relations, it may be difficult to predict the result.
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EXAMPLE
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> print max(2), max(5, 3, 7, 2, 9), max(3.2, -0.5, 8.7, -1.2, 2.5)
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2 9 8.7
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> print max(list(3,5), 7, list(6, list(7,8), 2))
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8
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> print max("one", "two", "three", "four")
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two
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> obj point {x, y}
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> define point_rel(a,b) = sgn(a.x - b.x)
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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 max(A, B, C)
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obj point {3, 3}
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> define point_max(a) = a.x
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> print max(A, B, C)
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3
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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 *qmax(NUMBER *x1, NUMBER *x2)
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SEE ALSO
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max, obj
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