/doc/efun/transpose_array

SYNOPSIS

mixed *transpose_array (mixed *arr);

DESCRIPTION

transpose_array ( ({ ({1,2,3}), ({a,b,c}) }) ) == ({ ({1,a}), ({2,b)}, ({3,c}) })

transpose_array() applied to an alist results in an array of ({ key, data }) pairs, useful if you want to use sort_array() or filter_array() on the alist.

EXAMPLE

	sort_array(transpose_array( ({ m_indices(map), m_values(map) }) ),
		   lambda( ({ 'a, 'b }),
			   ({ #'<, ({ #'[, 'a, 0 }),
				   ({ #'[, 'b, 0}) }) )

The given mapping 'map' is returned as an array of ({ key, data }) pairs, sorted by the keys.

SEE ALSO

alists

sort_array

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