HP Prime Graphing Wireless Calculator - Manual (Page 193)

Functions and commands 189
identity Given an integer n, returns the identity matrix of dimension n.
identity(Integer)
Example:
identity(3)
returns
iegcd Returns the extended greatest common divisor of two integers.
iegcd(Integer1, Integer2)
Example:
iegcd(14, 21)
returns
[-1, 1, 7]
igcd Returns the greatest common divisor of two integers or two
rational numbers or two polynomials of several variables.
igcd((Integer1, Integer2) or
igcd(Ratnl1, Ratnl2) or
igcd(Poly1, Poly2)
Examples:
igcd(24, 36) returns 12
igcd(2/3,3/4) returns 1/12
interval2center Returns the center of an interval.
interval2center(Interval)
Example:
interval2center(2..5)
returns
7/2
inv Returns the inverse of an expression or matrix.
inv(Expr) or inv(Matrix)
Example:
inv(9/5)
returns
5/9
iPart Returns a real number without its fractional part or a list of real
numbers each without its fractional part.
iPart(Real) or iPart(List)
Example:
iPart(4.3)
returns
4
1 0 0
0 1 0
0 0 1