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function [ dag ] = readInputStructure( sfile, labels )
%readInputStructure Read in file with structure information
%
%Input:
% sfile = name of the file containing the data (required)
% labels = cell array with node labels. (required)
% nnodes = number of columns in the data file. (required)
%
% Function assumes the following format for the structure input file:
% 1) The first line has node labels. These must be the same as
% in the input data file. They cannot contain spaces.
% 2) The remainder of the file contains the structure of the dag.
% The structure of a graph is a N-by-N matrix, where N is the
% number of nodes. There are 1's in the matrix representing
% parent-child relationships. For each 1, the row indicates
% the parent and the column indicates the child. For
% example, a 1 in the (2,3) position of the matrix indicates
% that there is an arc pointing from node 2 to node 3.
%
%
% Output:
% dag = matrix with the structure.
%
% Read in first line of the structure file
% open file for input, include error handling
fin = fopen(sfile,'r');
if fin < 0
error(['Could not open ',sfile,' for input']);
end
nnodes = size(labels,2);
% Read in first line to get the node labels.
labels_test = cell(1,nnodes);
buffer = fgetl(fin); %get header line as a string
for j=1:nnodes
[next,buffer] = strtok(buffer);
labels_test{j} = next;
end
for j=1:nnodes
if labels_test{j} ~= labels{j}
fprintf(['Label of node ',j,' is not consistent in input and structure files'])
end
end
data = fscanf(fin,'%f');
nd = length(data); % total number of data points
nr = nd/nnodes; % number of rows; check (next statement) to make sure
if nr ~= round(nd/nnodes)
fprintf(1,'\ndata: nrow = %f\tncol = %d\n',nr,nnodes);
fprintf(1,'number of data points = %d does not equal nrow*ncol\n',nd);
error('Structure file does not have the correct dimensions (1)')
end
% check to make sure that structure is square
if nr ~= nnodes
error('Structure file does not have the correct dimensions (2)')
end
data = reshape(data,nnodes,nr)'; % have to transpose the reshaped array
dag = zeros(nnodes,nnodes);
for i = 1:size(data,1)
for j = 1:size(data,2)
dag(i,j) = data(i,j);
end
end
end
% end of readInputStructure.m
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