Chapter 5 - Diffusion - Questions and Problems - Page 162: 5.5

For determining direction of the vector, vector tail is subtracted from head, so the resultant vector is $[-1,1,0]$

For determining direction of the vector, vector tail is subtracted from vector head: $0.5-1=-0.5$ $1-0.5=0.5$ $0.25-0.25=0$ The direction is generally put into integer form, so we multiply by 2: $2\times(-0.5)=-1$ $2\times(0.5)=1$ $2\times(0)=0$ So, the resultant vector is [-1,1,0]