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function list = ssgrep (expression, index)
%SSGREP search for matrices in the SuiteSparse Matrix Collection.
% ssgrep returns a list of Problem id's whose Problem.name string matches an
% expression. With no output arguments, the list is displayed. Otherwise, it
% is returned as a list of integer id's.
%
% Example:
% ssgrep ('HB') ; % all matrices in the HB group
% ssgrep ('\<B*') ; % all matrices in groups starting with the letter B
% ssgrep ('bp') ; % all bp matrices (in the HB group)
% ssgrep ('[0-9]') ; % all matrices with a digit in their name
% ssgrep ('c-') ; % all c-* optimization matrices (in 2 groups)
%
% An optional 2nd input argument is the SuiteSparse index, which is a little
% faster if ssgrep is used multiple times. With no input arguments, all
% Problems are listed.
%
% index = ssget ;
% ssgrep ('HB/*', index) ;
%
% See also regexp, ssget.
% Copyright 2009-2019, Timothy A. Davis
if (nargin < 2)
index = ssget ;
end
if (nargin < 1)
expression = '.' ;
end
nmat = length (index.nrows) ;
list1 = zeros (1, nmat) ;
matched = 0 ;
for id = 1:nmat
name = [index.Group{id} '/' index.Name{id}] ;
if (~isempty (regexp (name, expression, 'once')))
matched = matched + 1 ;
list1 (matched) = id ;
end
end
list1 = list1 (1,1:matched) ;
if (nargout == 0)
for id = list1
fprintf ('%4d: %s/%s\n', id, index.Group {id}, index.Name {id}) ;
end
else
list = list1 ;
end
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