Direction and signs of unit vectors

[warfreak131]

If I have a negative quantity pointing in the positive z direction, is that the same as a positive quantity pointing in the negative z direction?

e.g.

does $-A\hat{z}=A\hat{-z}$?

 

[nucl34rgg]

yes they are the same

 

[Dr_Morbius]

Vectors do not have negative magnitudes.

http://en.wikipedia.org/wiki/Magnitude_(vector)