interval-log2 ( i1 -- i2 )
Factor handbook » The language » Numbers » Intervals » Interval arithmetic

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interval-abs ( i1 -- i2 )

Vocabulary
math.intervals

Inputs

i1	an interval

Outputs

i2	an interval

Word description
Integer-valued Base-2 logarithm of an interval.

Examples

USING: math.intervals prettyprint ; 20 32 [a,b] interval-log2 .
T{ interval { from { 0 t } } { to { 5 t } } }

Definition

IN: math.intervals

GENERIC: interval-log2 ( i1 -- i2 )

Methods

USING: math.intervals ;

M: empty-interval interval-log2 ;


USING: kernel math.intervals ;

M: full-interval interval-log2 drop [0,inf] ;


USING: accessors kernel layouts math math.intervals math.order
sequences ;

M: interval interval-log2
    to>> first 1 max dup most-positive-fixnum >
    [ drop full-interval interval-log2 ]
    [ 1 + >integer log2 [0,b] ] if ;