61 lines
2.1 KiB
Factor
61 lines
2.1 KiB
Factor
! :folding=indent:collapseFolds=0:
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! $Id$
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!
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! Copyright (C) 2003, 2004 Slava Pestov.
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions are met:
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!
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! 1. Redistributions of source code must retain the above copyright notice,
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! this list of conditions and the following disclaimer.
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!
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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! this list of conditions and the following disclaimer in the documentation
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! and/or other materials provided with the distribution.
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!
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! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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IN: math
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USE: kernel
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: integer? dup fixnum? swap bignum? or ;
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: rational? dup integer? swap ratio? or ;
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: real? dup number? swap complex? not and ;
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: max ( x y -- z )
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2dup > [ drop ] [ nip ] ifte ;
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: min ( x y -- z )
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2dup < [ drop ] [ nip ] ifte ;
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: between? ( x min max -- ? )
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#! Push if min <= x <= max. Handles case where min > max
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#! by swapping them.
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2dup > [ swap ] when >r dupd max r> min = ;
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: sq dup * ; inline
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: pred 1 - ; inline
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: succ 1 + ; inline
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: neg 0 swap - ; inline
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: recip 1 swap / ; inline
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: rem ( x y -- x%y )
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#! Like modulus, but always gives a positive result.
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[ mod ] keep over 0 < [ + ] [ drop ] ifte ;
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: sgn ( n -- -1/0/1 )
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#! Push the sign of a real number.
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dup 0 = [ drop 0 ] [ 1 < -1 1 ? ] ifte ;
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