Reading a file and want to stop when the column ends

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

Answer 1

[Star Strider]

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.