How to select some element from matrix by simulink?

I want to get all element except -1 By Simulink For example:

u2 = [46.15 ; -22.5 ; -1 ; -1 ; -1 ];

I want to get new matrix to be u2 = [46.15 ; -22.5 ];

[Azzi Abdelmalek]

What u2 represent in your simulink model?