HP Prime Graphing Calculator - Manual (Page 398)

394 Functions and commands
ilaplace Returns the inverse Laplace transform of a rational fraction.
ilaplace(Expr,[Var],[IlapVar])
Example:
ilaplace(1/(x^2+1)^2)
gives
(-x)*cos(x)/
2+sin(x)/2
incircle Draws the incircle of triangle ABC.
incircle((Pnt or Cplx(A)),(Pnt or
Cplx(B)),(Pnt or Cplx(C)))
Example:
incircle(GA,GB,GC)
draws the incircle of ΔABC
inter With two curves or surfaces as arguments, returns the
intersection of the curves or surfaces as a vector. With a point
as the third argument, returns the intersection of the curves or
surfaces close to the point.
inter(Curve,Curve,[Pnt])
interval2center Returns the center of an interval or object.
interval2center(Interval or Real)
Example:
interval2center(2..5)
gives
7/2
inv Returns the inverse of an expression or matrix.
inv(Expr||Mtrx)
Example:
inv(9/5)
gives
5/9
inversion Returns point A1 such that A1 is on line CA and
mes_alg(CA1*CA)=k.
inversion(Pnt(C),Real(k),Pnt(A))
Example:
inversion(GA,3,GB)
draws point C on line AB such
that AB*AC=3. In this case, point A is the center of the
inversion and the scale factor is 3. Point B is the point
whose inversion is created.