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function stats = UFweb (matrix, opts)
%UFWEB opens the URL for a matrix.
%
% UFweb(matrix) opens the URL for a matrix. This parameter can be a string,
% or an integer. If it is a string with no "/" character, the web page for a
% matrix group is displayed. With no arguments, a list of all the matrix
% groups is displayed.
%
% Example:
%
% If Problem = UFget ('HB/arc130'), the first four examples display
% the same thing, the web page for the HB/arc130 matrix:
%
% UFweb (6)
% UFweb ('HB/arc130')
% stats = UFweb (6)
%
% The latter also returns statistics about the matrix or matrix group.
% To display the web page for the HB (Harwell-Boeing) group:
%
% UFweb ('HB')
%
% To display the home page for the UF sparse matrix collection:
%
% UFweb
% UFweb (0)
% UFweb ('')
%
% The latter two are useful if a second optional parameter is specified.
% The second optional argument is a string passed as additional parameters to
% the MATLAB web command. To use the system web browser instead of the MATLAB
% browser, for example, use UFweb ('HB/arc130', '-browser').
%
% See also web, UFget, UFget_defaults.
% Copyright 2008, Tim Davis, University of Florida.
params = UFget_defaults ;
UF_Index = UFget ;
if (nargin < 1)
matrix = '' ;
end
if (nargin < 2)
opts = '' ;
end
% get the matrix group, name, and id
[group name id] = UFget_lookup (matrix, UF_Index) ;
url = params.url ;
len = length (url) ;
if (strcmp (url ((len-3):len), '/mat'))
% remove the trailing '/mat'
url = url (1:(len-4)) ;
end
% open the web page for the matrix, group, or whole collection
if (id == 0)
if (isempty (group))
eval (['web ' url '/matrices/index.html ' opts])
else
eval (['web ' url '/matrices/' group '/index.html ' opts])
end
else
eval (['web ' url '/matrices/' group '/' name '.html ' opts])
end
% return stats
if (nargout > 0)
if (id == 0)
if (isempty (group))
% return stats about the whole collection
stats.nmatrices = length (UF_Index.nrows) ;
stats.LastRevisionDate = UF_Index.LastRevisionDate ;
stats.DownloadTime = datestr (UF_Index.DownloadTimeStamp) ;
else
% return stats about one matrix group
nmat = length (UF_Index.nrows) ;
ngroup = 0 ;
for i = 1:nmat
if (strcmp (group, UF_Index.Group {i}))
ngroup = ngroup + 1 ;
end
end
stats.nmatrices = ngroup ;
stats.LastRevisionDate = UF_Index.LastRevisionDate ;
stats.DownloadTime = datestr (UF_Index.DownloadTimeStamp) ;
end
else
% look up the matrix statistics
stats.Group = group ;
stats.Name = name ;
stats.nrows = UF_Index.nrows (id) ;
stats.ncols = UF_Index.ncols (id) ;
stats.nnz = UF_Index.nnz (id) ;
stats.nzero = UF_Index.nzero (id) ;
stats.pattern_symmetry = UF_Index.pattern_symmetry (id) ;
stats.numerical_symmetry = UF_Index.numerical_symmetry (id) ;
stats.isBinary = UF_Index.isBinary (id) ;
stats.isReal = UF_Index.isReal (id) ;
stats.nnzdiag = UF_Index.nnzdiag (id) ;
stats.posdef = UF_Index.posdef (id) ;
stats.amd_lnz = UF_Index.amd_lnz (id) ;
stats.amd_flops = UF_Index.amd_flops (id) ;
stats.amd_vnz = UF_Index.amd_vnz (id) ;
stats.amd_rnz = UF_Index.amd_rnz (id) ;
stats.metis_lnz = UF_Index.metis_lnz (id) ;
stats.metis_flops = UF_Index.metis_flops (id) ;
stats.metis_vnz = UF_Index.metis_vnz (id) ;
stats.metis_rnz = UF_Index.metis_rnz (id) ;
stats.nblocks = UF_Index.nblocks (id) ;
stats.sprank = UF_Index.sprank (id) ;
stats.nzoff = UF_Index.nzoff (id) ;
stats.dmperm_lnz = UF_Index.dmperm_lnz (id) ;
stats.dmperm_unz = UF_Index.dmperm_unz (id) ;
stats.dmperm_flops = UF_Index.dmperm_flops (id) ;
stats.dmperm_vnz = UF_Index.dmperm_vnz (id) ;
stats.dmperm_rnz = UF_Index.dmperm_rnz (id) ;
stats.RBtype = UF_Index.RBtype (id,:) ;
stats.cholcand = UF_Index.cholcand (id) ;
stats.ncc = UF_Index.ncc (id) ;
end
end
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