Use a column from a text file to find value of a parameter in for loop

I have a text file with 3 columns of numerical data. For every value of data in third column, I need to find the value of a paramete using for loop. How can i do this?

Answer 1

[darova]

fid = fopen('sowmya.txt');
A = fscanf(fid, '%g %g %g', [3 inf]);
fclose(fid);
A = A';
x = A(A:,3);    % entire 3th column

for i = 1:lentgh(x)
    x(i) = x(i) * rand;
end