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package Tree::M; |
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|
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use Carp; |
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use DynaLoader; |
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|
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BEGIN { |
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$VERSION = 0.01; |
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@ISA = qw(DynaLoader); |
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bootstrap Tree::M, $VERSION; |
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} |
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|
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=head1 NAME |
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|
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Tree::M - implement M-trees for efficient "multimedia-searched" |
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|
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=head1 SYNOPSIS |
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|
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use Tree::M; |
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|
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=head1 DESCRIPTION |
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|
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(not yet) |
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|
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Ever had the problem of managing multi-dimensional (spatial) data but your |
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database only had one-dimensional indices (b-tree etc.)? Queries like |
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|
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select data from table where latitude > 40 and latitude < 50 |
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and longitude> 50 and longitude< 70; |
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|
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are quite inefficient, unless longitude and latitude are part of the same |
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spatial index (e.g. a r-tree). |
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|
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An M-tree etc.. etc... |
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|
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=head2 THE Tree::M CLASS |
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|
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=over 4 |
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|
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=item $M = new Tree::M arg => value, ... |
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|
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... |
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|
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distance => specify a distance function. the default distance |
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method uses this function in some way. |
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keyof => the keyof method uses this argument to determine |
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the key of an object |
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min => the minimum number of objects stored in a node |
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max => the maximum number of objects stored in a node |
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|
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=cut |
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|
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=back |
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|
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=head1 AUTHOR |
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|
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Marc Lehmann <pcg@goof.com>. |
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|
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=head1 SEE ALSO |
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|
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perl(1), L<DBIx::SpatialKeys>. |
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|
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=cut |
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|
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1; |
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