Thread
:
Directional derivatives
View Single Post
Dick
#
5
Oct13-08, 03:33 PM
Sci Advisor
HW Helper
Thanks
P: 25,243
Quote by
alvielwj
But I cant get the meaning of "in the direction of increasing z"
Using your cross product you'll get a vector t for the tangent vector. But -t is also a tangent. Pick the one that has positive z component.