Function builtin_pgeom 

fn builtin_pgeom(
    args: &[RValue],
    named: &[(String, RValue)],
) -> Result<RValue, RError>

Geometric cumulative distribution function.

pgeom(q, prob) = 1 - (1-prob)^(floor(q)+1)

@param q quantile vector @param prob probability of success @return numeric vector of probabilities