Exit infinite loop in script via expression

Hi, is there a way to basically detect an infinite loop and stop it within a script programmatically? Let's say you had a vector, an a while loop which with a function puts a random number in the vector if there's space i.e. m(x, y) == 0. With the condition of the while loop being:

while (m(rrn, rcn) ~= 0)

where 'm' is the vector, 'rrn' is the 'random row number' etc.

[Jan]

The example is not clear to me. Why is this an infinite loop? As long as this is not clear, detecting such cases programmatically is impossible.