HP Prime Graphing Calculator - Manual (Page 382)

378 Functions and commands
center Displays a circle with its center indicated.
center(Crcle)
Example:
center(circle(x^2+y2–x–y))
gives
point(1/2,1/2)
cFactor Returns an expression factorized over the complex field (on
Gaussian integers if there are more than two ).
cfactor(Expr)
Example:
cFactor(x^2*y+y)
gives
(x+i)*(x-i)*y
charpoly Returns the coefficients of the characteristic polynomial of a
matrix. With only one argument, the variable used in the
polynomial is x. With a variable as second argument, the
polynomial is an expression of it.
charpoly(Mtrx,[Var])
chrem Returns the Chinese remainders for two lists of integers.
chrem(LstIntg(a,b,c....),LstIntg(p,q,r,....))
Example:
chrem([2,3],[7,5])
gives
[-12,35]
circle With two arguments, draws a circle. If the second argument
is a point, then the distance between it and the point given as
the first argument is equal to the diameter the circle. If the
second argument is a complex, then the center of the circle is
at the point given in the first argument and the absolute value
of the second argument is the radius of the circle.
circle((Pnt or Cplx(A)),(Pnt or
Cplx(B)),[Real(a)],[Real(b)],[Var(A)],[Var(B)
])
Example:
circle(GA,GB)
draws the circle with diameter AB
circumcircle Returns the circumcircle of the triangle ABC.
circumcircle((Pnt or Cplx(A)),(Pnt or
Cplx(B)),((Pnt or Cplx(C)))
Example:
circumcircle(GA,GB,GC)
draws the circle
circumscribed about ΔABC