Argthtjtr

I want the follow one, but my code dosen't achieve, can someone help?

my code:

begin{equation}

begin{aligned}

rho=left{

             begin{array}{lr}

             0, & |v_{y}^{CH}|<V_{1}^{T} \

             y=0.5, & V_{1}^{T}leq |v_{y}^{CH}|leq V_{2}^{T}, \

             z=1, & |v_{y}^{CH}|> V_{2}^{T}             

             end{array}

right.

end{aligned}

end{equation}

the result of my code:

Just declare the table with ll and not lr

begin{array}{ll}

documentclass[a4paper]{article}

usepackage{amsmath}

begin{document}

begin{equation}

begin{aligned}

rho=left{

             begin{array}{ll}

             0, & |v_{y}^{CH}|<V_{1}^{T} \

             y=0.5, & V_{1}^{T}leq |v_{y}^{CH}|leq V_{2}^{T}, \

             z=1, & |v_{y}^{CH}|> V_{2}^{T}             

             end{array}

right.

end{aligned}

end{equation}

end{document}

Why not use a simple cases environment?

documentclass[a4paper]{article}

usepackage{amsmath}



begin{document}



begin{equation}

rho=

             begin{cases}

             0, & |v_{y}^{CH}|<V_{1}^{T} \[1ex]

             y=0.5, & V_{1}^{T}leq |v_{y}^{CH}|leq V_{2}^{T}, \[1ex]

             z=1, & |v_{y}^{CH}|> V_{2}^{T}

             end{cases}

end{equation}



end{document}