HP Prime Graphing Wireless Calculator - Manual (Page 188)

184 Functions and commands
exponential_
regression
Given a set of points, returns a vector containing the
coefficients a and b of y=b*a^x, the exponential which best
fits the set of points. The points may be the elements in two
lists or the rows of a matrix.
exponential_regression(Matrix) or
exponential_regression(List1, List2)
Example:
exponential_regression
returns
1.60092225473,1.10008339351
EXPR Parses a string into a number or expression and returns the
result evaluated.
EXPR(String)
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(Poly1,Poly2)
Example:
ezgcd(x^2-2*x-x*y+2*y,x^2-y^2)
returns
x-y
f2nd Returns a vector consisting of the numerator and denominator
of an irreducible form of a rational fraction.
f2nd(RatFrac)
Example:
f2nd
returns
factorial Returns the factorial of an integer or the solution to the gamma
function for a non-integer. For an integer n, factorial(n)=n!. For
a non-integer real number a, factorial(a)=a! = Gamma(a + 1).
factorial(Integer) or factorial(Real)
1.0 2.0
0.0 1.0
4.0 7.0
 
 
 
 
 
x
x x ⋅
--------------
 
 
 
1 x