Does Big O Measure Memory Requirments Or Just Speed?

Question

I often here people talk about Big O which measures algorithms against each other

Does this measure clock cycles or space requirements.

If people want to contras

Answer 1

Big-O can be used to describe the relationship between any two quantities. Although it is generally only used in computer science, the concept may also be applicable in other fields like physics. For example, the amount of power that must be put into an antenna of a given size to yield a unit-strength signal at some distance is O(d^2), regardless of the antenna shape. If the size of the antenna is large relative to the distance, the increase in strength required may be linear or even sub-linear rather than quadratic, but as the distance gets larger, the quadratic term will dominate.