MATLAB: Reading a file and want to stop when the column ends

loopreading filesreadingfiles

I am collecting the informaiton from the first row of a set of columns from a notepad file.
It reads the file, but the while loop doesnt stop nor does it continue to the next line as I want it to.
I also dont know how many rows there are so I dont know an appropriate condition to give the while loop for it to stop when the row of numbers stop.
for example I just want the bolded numbers.
ex:
3651 4007 4015 2 0.560
3652 4015 4023 2 0.274
NODAL COORDINATES
*****************
NODE X-COORD Y-COORD Z-COORD
(mm) (mm) (mm)
…
        fid_tr = fopen('Struct.S3E');         
        line_in_tr = fgets(fid_tr);                                              
        lineinfo_tr  = sscanf(line_in_tr,'%f');
        stp_crit_tr = '                                 TRUSS ELEMENTS';        
        stop_tr = contains(line_in_tr,stp_crit_tr);                              
        while stop_tr == 0 
            line_in_tr = fgets(fid_tr);                                          
            stop_tr = contains(line_in_tr,stp_crit_tr);                          
        end
        for i = 1:1:5                                                          
            line_in_tr = fgets(fid_tr);
        end
        long_mat = 0;
        tie_mat = 0;
        long_elmnts = [];
        tie_elmnts = [];
        t=1;
        r=1;
        node_per_layer = 64;
            while isnumeric(lineinfo_tr(1))== 1                 %This line is the issue
                if isempty(long_elmnts) ==1
                    if abs(lineinfo_tr(2) - lineinfo_tr(3)) == node_per_layer
                        long_mat = lineinfo_tr(4);
                        long_elmnts(t) = lineinfo_tr(4);
                        t=t+1;
                        line_in_tr = fgets(fid_tr);
                    end
                end
                if isempty(tie_elmnts) ==1
                    if abs(lineinfo_tr(2) - lineinfo_tr(3)) ~= node_per_layer
                        tie_mat =lineinfo_tr(4);
                        tie_elmnts(r) = lineinfo_tr(4);
                        r=r+1;
                        line_in_tr = fgets(fid_tr);
                    end
                end
            end

Best Answer

Perhaps textscan can do what you want: 
fid_tr = fopen('Struct.S3E');
c = textscan(fid_tr '%f%*f%*f%*%*f')
cd= cell2mat(c);
fclose(fid_tr);
This reads the first value in the field, ignoring the others. See the documentation for specific name-value pair arguments to customise it to do what you want.
It would likely heop to have your file (or a representative sample if it is too large) to work with.
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