position XYZ - Value - move only one axe

So i finally figured this one out on my own :-)
it is simple i know, but it is latin for me, and i don't know latin.
it is a tweak from "wiggle in 3d" and pretty simple, and i knew the "value" expresion, but i did'n know the linguistic in how to put it in context. so i think it can be tweaked it to a lot of places, where you want Expresions and "value" inputs at the same time. 

 example (3 axes) - Steady speed Z axe: 

a=value;
b=value;
c=value;
[a[0],b[1],c[2]+(time*160)]

 example (2 axes) - Steady speed y axe: 

a=value;
b=value;

[a[0],b[1]+(time*160)]