Sorry if the title is not clear enough, it is quite hard to put in to simple word. In the current Matlab code I am working on, I have a while loop of the type:
while and(X > eps1, Y > eps2) && count < it_max
with X, Y the variables of interest; eps1, eps2 the stopping criterias. My problem is that eps1 and eps2 are positive, and X and Y can take negative values. However these must be positive and I would like to add a condition to make the while loop continue when X and Y are negative (without any absolute value function).