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function [group, name, id] = SJget_lookup (matrix, SJ_Index)
%SJGET_LOOKUP gets the group, name, and id of a matrix.
%
% Example:
% SJ_Index = SJget;
% matrix = 'Pajek/USpowerGrid';
% [group name id] = SJget_lookup (matrix, SJ_Index)
% % or
% matrix = 50;
% [group name id] = SJget_lookup (matrix, SJ_Index)
%
% See also SJget.
% spqr_rank, Copyright (c) 2012, Leslie Foster and Timothy A Davis.
% All Rights Reserved.
% SPDX-License-Identifier: BSD-3-clause
if (isnumeric (matrix))
% make sure that the matrix parameter is only one integer value
% this means that if we get an array, just use the first value
id = fix (full (matrix (1))) ;
% if the index is less than one or bigger than the length of the array,
% then no particular matrix is accessed
if (id > length (SJ_Index.nrows) | id < 1) %#ok
id = 0 ;
group = '' ;
name = '' ;
else
% assign the group and name for the given id
group = SJ_Index.Group {matrix} ;
name = SJ_Index.Name {matrix} ;
end
elseif (ischar (matrix))
% the group and matrix name are in the string as in GroupName\MatrixName
% find the group index for the file separator
% check both types of slashes, and a colon
gi = find (matrix == '/') ;
if (length (gi) == 0) %#ok
gi = find (matrix == '\') ;
end
if (length (gi) == 0) %#ok
gi = find (matrix == ':') ;
end
% if no name divider is in the string, a whole group is specified
if (length (gi) == 0) %#ok
id = 0 ;
group = matrix ;
name = '' ;
else
% group equals the first part of the string up to the character before
% the last file separator
group = matrix (1:gi(end)-1) ;
% group equals the last section of the string after the last file
% separator
name = matrix (gi(end)+1:end) ;
% validate the given name and group by checking the index for a match
%refName = strmatch (name, SJ_Index.Name) ;
refName = find(strncmp(name, SJ_Index.Name, length(name))) ;
%refGroup = strmatch (group, SJ_Index.Group) ;
refGroup = find(strncmp(group, SJ_Index.Group, length(group))) ;
id = intersect (refName, refGroup) ;
if (length (id) >= 1)
id = id (1) ;
else
% the given group/matrix does not exist in the index file
id = 0 ;
end
end
else
% there is an error in the argument types passed into the function
error ('invalid input') ;
end
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