how do I take a component of vector?

[v-alisei]

Say I have a function f(x,y,z)=[-y,x,z] how do I take i-th vector parameter? f(x,y,z).x doesn't work...

[v-alisei]

oh, I got it) just use [f(x,y,z)[1],0,0]

[ChristopherChudzicki]

@v-alisei Another good option is dot products... [f(x, y, z) * i, 0, 0]. Or, depending on the circumstance, define the components of f separately.