Be careful absolute value function suffer from overflow and underflow for vectors

Interesting, yes. I can understand the "Infinity" part (which is better than MC15's 0) as it may be the result of calculating the v^T*v first, which exceeds the IEEE limit, and the root of "infinity" is "infinity" again. But I am confused about the doubled minus sign in the exponent in front of the 2^31 (the largest 32 bit integer is 2^31-1, the most small is -2^31).