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39 lines
667 B
Plaintext
39 lines
667 B
Plaintext
NAME
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select - form a list by selecting element-values from a given list
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SYNOPSIS
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select(x, y)
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TYPES
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x list
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y string
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return list
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DESCRIPTION
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If y is to be the name of a user-defined function, select(x, y)
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returns a list whose members are the values z of elements of x
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for which the function at z tests as nonzero.
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The list x is not changed. The order of the returned list is
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the same as in x.
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EXAMPLE
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> define f(x) = x > 5
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> A = list(2,4,6,8,2,7)
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> print select(A, "f")
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list (3 elements, 3 nonzero):
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[[0]] = 6
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[[1]] = 8
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[[2]] = 7
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LIMITS
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none
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LIBRARY
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none
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SEE ALSO
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XXX - fill in
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