i wrote a scipt to findout the points satisfying the Equation of a straight line in two-points form (two points are known). i have 3 column of data lat,long depth

i want to get lat&long satisfying the equation and corresponding depth. s=[]; x=D(1:end,1); y=D(1:end,2); z=D(1:end,3); x1=2.5076; x2=15.5153; y1=53.9917; y2=66.9917; z1=-5040; s = nan(count,3) ; data2=[x1 y1 z1]; data2(1,:) = [x1 y1 z1]; count=length(x); for i=1:count x3=x(i); y3=y(i); equ=(y3-y1)./(y2-y1); eqq=(x3-x1)./(x2-x1); s=[s;x3 y3 equ]; if equ==eqq z=z(i); data2=[data2; x3 y3 z3]; end end

[Jos (10584)]

what is the problem? And why does this look so familiar ??

http://www.mathworks.nl/matlabcentral/answers/116419-this-program-taking-a-long-time-to-run-and-i-did-t-get-the-answer-also-due-to-this-problem-how-can