a1=load('switch.t01.new.txt');
>> node_1=a1(:,1);
>> node_2=a1(:,2);
>> data=table(node_1,node_2);
>> writetable(data, 'switch.t01.csv');
a1=load('switch.t01.new.txt');
>> node_1=a1(:,1);
>> node_2=a1(:,2);
>> data=table(node_1,node_2);
>> writetable(data, 'switch.t01.csv');