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Full Discussion: Random Line
Top Forums Shell Programming and Scripting Random Line Post 31875 by Perderabo on Thursday 14th of November 2002 10:47:56 AM
Old 11-14-2002
Suppose that you want to pick a random line froma file that has exactly 100 lines. You can label the lines 0 through 99. Then if you get a random integer, you just take the last two digits as your line number.

Those last 2 digits are the remainder that your get when you divide the random integer by 100. So for example, if the random integer is 10726352; you would have a remainder of 52 after dividing 10726352 by 100. This is expressed as
10726352 % 100 = 52
and % is sometimes called "the remainder function". And sometimes "modulus".

But is was important to divide by 100 since we had 100 lines in our file. When we divide by 100, we have 100 possible remainders, so each line in the file has a chance.

To make this general, don't divide by 100 (or 50) all the time, divide by the count of items.
 

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LEARN ABOUT DEBIAN

tm::coverage

TM::Coverage(3pm)					User Contributed Perl Documentation					 TM::Coverage(3pm)

NAME

       TM::Coverage - Topic Maps, Code Coverage

DESCRIPTION

       This auxiliary package keeps track of the code coverage. Probably quite irrelevant for a user.

       Automatically generated for TM (1.44).

	  ---------------------------- ------ ------ ------ ------ ------ ------ ------
	  File				 stmt	bran   cond    sub    pod   time  total
	  ---------------------------- ------ ------ ------ ------ ------ ------ ------
	  blib/lib/TM.pm		 96.4	84.5   58.0   93.7   90.6   27.5   89.6
	  blib/lib/TM/Analysis.pm	100.0	90.9	n/a  100.0  100.0    0.0   97.5
	  blib/lib/TM/AsTMa/Fact.pm	100.0	 n/a	n/a  100.0    n/a    0.0  100.0
	  blib/lib/TM/AsTMa/Fact2.pm	100.0	 n/a	n/a  100.0    n/a    0.0  100.0
	  blib/lib/TM/Bulk.pm		 76.8	71.4   62.5   85.7  100.0    0.0   75.3
	  blib/lib/TM/CTM/CParser.pm	 65.6	34.3   31.0   84.6    0.0    1.6   52.5
	  blib/lib/TM/CTM/Parser.pm	 90.9	50.0	n/a  100.0    0.0    0.0   79.4
	  blib/lib/TM/DM.pm		100.0	65.0   66.7  100.0    n/a    0.0   96.5
	  blib/lib/TM/Graph.pm		 99.1	88.5	n/a  100.0  100.0    0.0   97.4
	  blib/lib/TM/Index.pm		100.0	80.0   60.0  100.0   83.3    0.3   87.8
	  .../Index/Characteristics.pm	100.0  100.0	n/a  100.0    0.0    0.0   97.0
	  blib/lib/TM/Index/Match.pm	 98.5	87.5	n/a  100.0  100.0    0.5   97.6
	  blib/lib/TM/LTM/CParser.pm	 84.9	45.3   42.7   98.2    0.0    0.2   67.8
	  blib/lib/TM/LTM/Parser.pm	 95.7	62.5   50.0  100.0    0.0    0.0   87.1
	  blib/lib/TM/Literal.pm	 45.8	 0.0   11.8   30.0    0.0    0.4   24.2
	  blib/lib/TM/MapSphere.pm	 96.5	84.6   68.8  100.0  100.0    0.0   91.7
	  .../TM/Materialized/AsTMa.pm	100.0	 n/a	n/a  100.0    0.0    0.0   95.5
	  ...ib/TM/Materialized/LTM.pm	100.0	 n/a	n/a  100.0    0.0    0.0   95.5
	  .../TM/Materialized/MLDBM.pm	100.0	83.3	n/a  100.0    0.0    0.0   92.6
	  ...b/TM/Materialized/Null.pm	100.0	 n/a	n/a  100.0    n/a    0.0  100.0
	  ...TM/Materialized/Stream.pm	100.0  100.0  100.0  100.0    0.0    0.0   96.0
	  ...ib/TM/Materialized/XTM.pm	100.0	 n/a	n/a  100.0    0.0    0.0   96.7
	  blib/lib/TM/PSI.pm		100.0	 n/a	n/a  100.0    n/a    0.0  100.0
	  blib/lib/TM/QL.pm		 91.4	61.5   66.7  100.0   50.0    0.1   83.9
	  blib/lib/TM/QL/CParser.pm	 76.2	42.4   41.9   90.3    0.0    9.1   62.0
	  blib/lib/TM/QL/PE.pm		 83.8	77.3   80.0   91.7    0.0   52.5   80.5
	  blib/lib/TM/QL/TS.pm		 65.2	35.4   27.8   70.8   53.3    2.4   56.9
	  blib/lib/TM/ResourceAble.pm	 88.1	87.5	n/a  100.0  100.0    0.0   90.0
	  .../TM/ResourceAble/MLDBM.pm	100.0	75.0	n/a  100.0    0.0    0.0   94.2
	  blib/lib/TM/Serializable.pm	 94.9	65.6  100.0  100.0  100.0    0.0   84.1
	  .../TM/Serializable/AsTMa.pm	 99.1	87.9   66.7  100.0  100.0    0.0   94.2
	  ...TM/Serializable/Dumper.pm	100.0	 n/a	n/a  100.0    0.0    0.0   93.5
	  ...ib/TM/Serializable/LTM.pm	 94.1	 n/a	n/a   83.3  100.0    0.0   92.0
	  ...ib/TM/Serializable/XTM.pm	 96.3	85.2   72.9  100.0  100.0    0.2   91.5
	  .../lib/TM/Synchronizable.pm	100.0	75.0  100.0  100.0  100.0    0.0   97.2
	  ...M/Synchronizable/MLDBM.pm	100.0	50.0	n/a  100.0    0.0    0.0   89.3
	  ...nchronizable/MapSphere.pm	100.0	63.6   64.3  100.0  100.0    0.0   88.6
	  ...TM/Synchronizable/Null.pm	100.0	 n/a	n/a  100.0    0.0    0.0   87.5
	  blib/lib/TM/Tau.pm		100.0	91.7   80.0  100.0    0.0    0.0   95.6
	  blib/lib/TM/Tau/Federate.pm	 63.2	39.3	n/a   62.5   27.3    0.0   54.5
	  blib/lib/TM/Tau/Filter.pm	100.0	91.7   66.7  100.0   50.0    0.0   90.0
	  .../TM/Tau/Filter/Analyze.pm	100.0	 n/a	n/a  100.0  100.0    0.0  100.0
	  blib/lib/TM/Tree.pm		100.0	57.1   44.4  100.0   66.7    0.0   88.0
	  blib/lib/TM/Utils.pm		100.0	50.0	n/a  100.0    0.0    0.0   89.3
	  ...ib/TM/Utils/TreeWalker.pm	100.0  100.0	n/a  100.0    0.0    0.0   96.0
	  ...ib/TM/Workbench/Plugin.pm	100.0	 n/a	n/a  100.0    0.0    0.0   75.0
	  ...M/Workbench/Plugin/Tau.pm	 87.5	50.0	n/a   80.0    0.0    0.0   73.1
	  yapp/astma-fact.yp		 96.9	91.5   73.3   97.8    0.0    4.8   92.7
	  yapp/astma2-fact.yp		 97.4	91.6   58.3  100.0    0.0    0.2   91.6
	  Total 			 76.8	45.2   40.2   91.2   57.0  100.0   63.8
	  ---------------------------- ------ ------ ------ ------ ------ ------ ------

SEE ALSO

       TM

COPYRIGHT AND LICENSE

       Copyright 200[8] by Robert Barta, <drrho@cpan.org>

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.10.1							    2008-10-05							 TM::Coverage(3pm)
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