HP Prime Graphing Wireless Calculator - Manual (Page 205)

Functions and commands 201
With a matrix as the first argument, returns the element-by-
element product of the matrix.
product(Expr, Var, Min, Max, Step) or
product(List) or product(Matrix)
Example:
product(n,n,1,10,2)
gives
945
propfrac Returns a fraction or rational fraction A/B simplified to Q+r/
B, where R
propfrac(Fraction) or propfrac(RatFrac)
Example:
propfrac(28/12)
gives
2+1/3
ptayl Given a polynomial P and a value a, returns the Taylor
polynomial Q such that P(x)=Q(x – a).
ptayl(Poly, Value, [Var])
Example:
ptayl(x^2+2*x+1,1)
gives
x^2+4*x+4
purge Unassigns a variable name.
purge(Var)
q2a Given a quadratic form and a vector of variables, returns the
matrix of the quadratic form with respect to the given
variables.
q2a(Expr, Vector)
Example:
q2a(x^2+2*x*y+2*y^2,[x,y])
returns
quantile Given a list or vector, and a quantile value between 0 and 1,
returns the corresponding quantile of the elements of the list
or vector.
quantile(List, Value) or
quantile(Vector, Value)
Example:
quantile([0,1,3,4,2,5,6],0.25) returns 1
1 1
1 2