std::hermite, std::hermitef, std::hermitel

Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals TS v2)
Library fundamentals 3 (library fundamentals TS v3)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Concepts (concepts TS)
Ranges (ranges TS)
Mathematical special functions (special functions TR)
double      hermite( unsigned int n, double x );

double      hermite( unsigned int n, float x );
double      hermite( unsigned int n, long double x );
float       hermitef( unsigned int n, float x );

long double hermitel( unsigned int n, long double x );
double      hermite( unsigned int n, IntegralType x );
1) Computes the (physicist's) Hermite polynomials of the degree n and argument x
4) A set of overloads or a function template accepting an argument of any integral type. Equivalent to (1) after casting the argument to double.

As all special functions, hermite is only guaranteed to be available in <cmath> if __STDCPP_MATH_SPEC_FUNCS__ is defined by the implementation to a value at least 201003L and if the user defines __STDCPP_WANT_MATH_SPEC_FUNCS__ before including any standard library headers.


[edit] Parameters

n - the degree of the polynomial
x - the argument, a value of a floating-point or integral type

[edit] Return value

If no errors occur, value of the order-nHermite polynomial of x, that is (-1)n
, is returned.

[edit] Error handling

Errors may be reported as specified in math_errhandling

  • If the argument is NaN, NaN is returned and domain error is not reported
  • If n is greater or equal than 128, the behavior is implementation-defined

[edit] Notes

Implementations that do not support TR 29124 but support TR 19768, provide this function in the header tr1/cmath and namespace std::tr1

An implementation of this function is also available in boost.math

The Hermite polynomials are the polynomial solutions of the equation u,,
= -2nu

The first few are:

  • hermite(0, x) = 1
  • hermite(1, x) = 2x
  • hermite(2, x) = 4x2
  • hermite(3, x) = 8x3
  • hermite(4, x) = 16x4

[edit] Example

(works as shown with gcc 6.0)

#include <cmath>
#include <iostream>
double H3(double x) { return 8*std::pow(x,3) - 12*x; }
double H4(double x) { return 16*std::pow(x,4)-48*x*x+12; }
int main()
    // spot-checks
    std::cout << std::hermite(3, 10) << '=' << H3(10) << '\n'
              << std::hermite(4, 10) << '=' << H4(10) << '\n';



[edit] See also

Laguerre polynomials
(function) [edit]
Legendre polynomials
(function) [edit]

[edit] External links

Weisstein, Eric W. ""Hermite Polynomial." From MathWorld--A Wolfram Web Resource.