HP Prime Graphing Calculator - Manual (Page 391)

Functions and commands 387
EXPR Parses the string str into a number or expression.
expr (str)
Examples:
expr("2+3") returns 5
.
expr("X+10")
returns
100
.
(If the variable X has the value 90)
ezgcd Uses the EZ GCD algorithm to return the greatest common
divisor of two polynomials with at least two variables.
ezgcd(Poly,Poly)
Example:
ezgcd(x^2-2*xy+y^2-1,x-y)
gives
1
f2nd Returns a list consisting of the numerator and denominator of
an irreducible form of a rational fraction.
f2nd(RatFrac)
Example:
f2nd(42/12)
returns
[7,2]
faces Returns the list of the faces of a polygon or polyhedron. Each
face is a matrix of n rows and three columns (where n is the
number of vertices of the polygon or polyhedron).
faces(Polygon or Polyedr)
Example:
faces(polyhedron([0,0,0],[0,5,0],[0,0,5],[1,2
,6]))
gives
polyhedron[[[0,0,0],[0,5,0],[0,0,5]],[[0,0,0]
,[0,5,0],[1,2,6]],[[0,0,0],[0,0,5],[1,2,6]],[
[0,5,0],[0,0,5],[1,2,6]]]
factorial Returns the factorial of an integer or the solution to the gamma
function for a non-integer.
factorial(Intg(n)||Real(a))
Example:
factorial(4)
gives
24