[Closed] Achieve the desire Node axis without negative scaling or mirroring

Hi every body

Maybe the title is not clear hope the example make it clear

TheObj = teapot pos:[0,-100,0]
DesireAxis = TheObj.transform*=(scalematrix [1,-1,1])
TheObj.scale
[-1,-1,-1]

The z and X are the same but Y is flipped and i I like to keep this order, but no negative scale is it possible?