Problem using fscanf

[Utherr13]

I have a file which has integers in a 100x2 matrix. I want to get the second
column and put it in a variable, in which i used a for 1:100, but on the i+1
(from the second) the variable is "[](0x1)"

for i=1:100
                z = fscanf(f,'%d',1);
                a = fscanf(f,"%d",1);
                disp(a);
endfor

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