id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
3449,introduce new free functions to access matrix/vector properties,Gunter,Gunter,"introduce new functions to make the access to important matrix properties more user friendly. The required functions are:

''for vector expression''
{{{
size( v ); // the number of elements in the vector
size<1>( v ); // synonym of size( v )
}}}
''for matrix expression''
{{{
// rationale: this is the most common name in mathematics
num_rows( m );    // return number of rows
num_columns( m ); // return number of row
}}}
{{{
// rationale: size<i> gives the size of the i-th index of operator()
size<1>( m );     // synonym of num_rows( m )
size<2>( m );     // synonym of num_columns( m )
}}}
''for matrix containers''
{{{
size<tag::major>( m ); // return the number of elements in the outer loop
size<tag::minor>( m ); // return the number of elements in the inner loop
}}}
''maybe for dense matrix proxies''
{{{
// rationale: this is widely used by LAPACK and similar 
size<tag::leading>( m ); // return the leading dimension 
}}}
'''note:''' The leading dimension is the distance in memory between elements of two consecutive rows/columns which have the same colum/row index. This value must be extracted from the underlying matrix container.

",Feature Requests,closed,Boost 1.41.0,uBLAS,Boost Release Branch,Optimization,fixed,,