1Math::NumSeq::DigitCounUts(e3r)Contributed Perl DocumentMaattiho:n:NumSeq::DigitCount(3)
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NAME

6       Math::NumSeq::DigitCount -- count of a given digit
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SYNOPSIS

9        use Math::NumSeq::DigitCount;
10        my $seq = Math::NumSeq::DigitCount->new (radix => 10,
11                                                 digit => 9);
12        my ($i, $value) = $seq->next;
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DESCRIPTION

15       The count of how many of a given digit is in $i when written out in a
16       given radix.  The default is to count how many 9s in decimal.
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18           0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, ...
19           starting i=0
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21       For example i=19 has a single "9" so value=1.
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23       The "radix" and "digit" options can select a different number base or
24       different digit to count.  For example to count the 0-bits in binary,
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26           # radix=>2, digit=>0
27           0, 0, 1, 0, 2, 1, 1, 0, 3, 2, 2, 1, 2, 1, 1, 0, 4, 3, 3, 2, ...
28           starting i=0
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30       i=0 is treated as no digits at all, so it has value=0 for the count of
31       0-bits, and similarly in other bases counting 0 digits.
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33       Option "digit => -1" gives the highest digit in the radix, ie. radix-1.
34       This is the default, so if "radix" is given the count is of its biggest
35       digit.
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FUNCTIONS

38       See "FUNCTIONS" in Math::NumSeq for behaviour common to all sequence
39       classes.
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41       "$seq = Math::NumSeq::DigitCount->new (radix => $r, digit => $d)"
42           Create and return a new sequence object.
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44           "digit" can be -1 to mean digit radix-1, the highest digit in the
45           radix.
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47   Random Access
48       "$value = $seq->ith($i)"
49           Return how many of the given "digit" is in $i written in "radix".
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51       "$bool = $seq->pred($value)"
52           Return true if $value might occur as a digit count, which means
53           simply "$value>=0".
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SEE ALSO

56       Math::NumSeq, Math::NumSeq::DigitLength,
57       Math::NumSeq::RadixWithoutDigit
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HOME PAGE

60       <http://user42.tuxfamily.org/math-numseq/index.html>
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LICENSE

63       Copyright 2010, 2011, 2012, 2013, 2014, 2016, 2017, 2019 Kevin Ryde
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65       Math-NumSeq is free software; you can redistribute it and/or modify it
66       under the terms of the GNU General Public License as published by the
67       Free Software Foundation; either version 3, or (at your option) any
68       later version.
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70       Math-NumSeq is distributed in the hope that it will be useful, but
71       WITHOUT ANY WARRANTY; without even the implied warranty of
72       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
73       General Public License for more details.
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75       You should have received a copy of the GNU General Public License along
76       with Math-NumSeq.  If not, see <http://www.gnu.org/licenses/>.
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80perl v5.32.0                      2020-07-28       Math::NumSeq::DigitCount(3)
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