How to set the anchoredPosition of a RectTransform via script in Unity3D -

i trying set anchoredposition of ui image instance programmatically. have tried these ways:

getcomponent<recttransform>().anchoredposition=new vector2(0,0); 

and

getcomponent<recttransform>().anchoredposition.set(0,0); 

but none of above seem work. infact when run program, in inspector says anchoredposition (0.5,0.5). , puts image likes. that?