# f decreases most rapidly at Q

• May 2nd 2008, 12:04 AM
vincent8818
f decreases most rapidly at Q
Find a unit vector in the direction in which f decreases most rapidly at Q
Thank u!
• May 2nd 2008, 01:21 AM
CaptainBlack
Quote:

Originally Posted by vincent8818
Find a unit vector in the direction in which f decreases most rapidly at Q
Thank u!

$\nabla f$ is the direction of most rapid increase, so $-\nabla f$ is the direction of most rapid decrease, so now you need only normalise it.

RonL