p_adic_order(N,p)

This function calculates the p-adic valuation (equivalent to p-adic order) of a rational number N

function r=p_adic_order(N,p)

This function calculates the p-adic valuation (equivalent to p-adic order) of a rational number N.
p must to be a prime number and N a rational number, if N is not a rational number this function takes the rational fraction approximation of N.
Examples p_adic_order(0,p)=Inf, p_adic_order(1,p)=0, p_adic_order(25/7,5)=2, p_adic_order(-25/7,5)=2
p_adic_order(7/25,5)=-2