  For an integer $p\geq 2$ we construct vertical and horizontal one-pth Riordan
arrays from a Riordan array. When $p=2$, one-pth Riordan arrays reduced to well
known half Riordan arrays. The generating functions of the $A$-sequences of
vertical and horizontal one-pth Riordan arrays are found. The vertical and
horizontal one-pth Riordan arrays provide an approach to construct many
identities. They can also be used to verify some well known identities readily.
