Matrix help in MatLab, Not the simple matrix!! I have searched, found nothing! Please help me with this. I need to code into matlab a function that results in a matrix answer. It is this: phi(i,j)=atan((eta(j)-eta(i))/(zeta(j)-zeta(i)))*180/pi] Here is my code so far: See I need a 4X4 matrix for phi. I only have four etas and four zetas. both i and j = 4. With some work I can get a 4x4 matrix but it isn't coded right. It gives me the same answers in rows. It should have a diagonal line of zero's from top left to bottom right because that is where i=j And I need to be able to change N to 250 so it needs to be easy to write for large N's Thank you for your help!