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michaesp |
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% Read a trajectory file
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function out = read_trajectory(filename);
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% Open the trajectory file
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fid = fopen(filename,'r')
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% Read the info line (tra.info)
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line = textscan(fid,'%s',1,'delimiter','\n');
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tra.info = line{1};
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% Read the line with field description (skip empty lines)
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textscan(fid,'%s',1,'delimiter','\n');
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line = textscan(fid,'%s',1,'delimiter','\n');
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textscan(fid,'%s',1,'delimiter','\n');
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line = char(line{1});
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% Get the names of the fields (tra.field, tra.nfield)
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indl = 1;
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indr = 1;
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tra.nfield = 0;
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while ( indl <= length(line) )
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while ( line(indl) == ' ' )
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indl=indl+1;
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end
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indr=indl;
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while ( (line(indr) ~= ' ') & (indr < length(line)) )
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indr=indr+1;
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end
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tra.nfield = tra.nfield + 1;
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tra.field(tra.nfield) = cellstr(line(indl:indr));
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indl = indr + 1;
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end
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% Get the number of times for a single trajectory (tra.ntime)
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fpos = ftell(fid);
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textscan(fid,'%s',1,'delimiter','\n');
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line = textscan(fid,'%s',1,'delimiter','\n');
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tra.ntime = 0;
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while ( ~ strcmp(cellstr(line{1}),'') )
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line = textscan(fid,'%s',1,'delimiter','\n');
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tra.ntime = tra.ntime + 1;
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end
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fseek(fid,fpos,'bof');
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% Read the trajectories
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format = '';
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for i=1:tra.nfield
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format = [ format '%n' ];
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end
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lines = textscan(fid,format);
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% Set the total number of trajectories
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tra.ntra = length(lines{1})/tra.ntime;
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% Attribute the field names to the columns
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for i=1:tra.nfield
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name = char(tra.field(i));
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tra.(name) = lines{i};
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end
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% Attribute a unique label to each trajectory
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tra.label = 1+floor( (0:tra.ntra*tra.ntime-1) / tra.ntime )';
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% Close trajectory file
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fclose(fid);
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% Return the output structure
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out = tra;
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