Quote:
Originally Posted by mEmmerrr
(grad . a)b where the . is dot product obv.
with
(a . grad)b
To me, grad . a means dax/dx + day/dy + daz/dz, which is a scalar function that can then be multiplied by the vector b to form a vector
a . grad means ax * d/dx + ay * d/dy + az * d/dz which is a scalar operator which, when acting on a vector, returns a vector.