Scalar functions


Random numbers using GSL
void	rng_init ()
	Initializes the random number generator.
double	randomFlat ()
	Retruns a random number in the interval ]0;1[.
double	randomGaussian (double mu, double sigma)
	Retruns a random number on a Gaussian distribution.
double	randomExp (double mu)
	Retruns a random number on a Gaussian distribution.
double	randomRayleigh (double sigma)
	Retruns a random number on a Rayleigh distribution.
Mathematical scalar functions using GSL
double	bessel (double x, int n)
double	airy (double x)
double	erf (double x)
double	gamma (double x)
double	beta (double a, double b)
double	factorial (int n)
	Return the factorial of n.
double	binomialCoefficient (int n, int k)
	Return the binomial coefficient of n and k, .
String tools
*string	fileNumber (int number, int ndigits=0)
	Create a string from an integer.
template<class T>
*string	formatNumber (T number, const char *format)
	Format a number.
template<class T>
string	sconv (T t)
	Convert an object of any type to a string.
template<class T>
T	conv (string s)
template<class T>
T	getField (string str, int field)
template<>
string	getField< string > (string str, int field)
Standard scalar functions
template<class T>
largest< float, T >::type	sinc (T x)
	Return sinc(x) = sin(x)/x.
template<class T>
T	step (T x)
	Return the value of the step function: 0 if x<0 and 1 otherwise.
template<class T, class T2>
T	round (T x, T2 s=1)
	Round the number with a precision defined by s.

Detailed Description

Scalar functions available with IDIL: exp, sin, cos, floor, ceil, etc...

double airy ( double x ) [inline]

Return the value of the Airy function: $Ai(x) = (1/\pi) \int_0^\infty \cos((1/3) t^3 + xt) dt$

Return the value of the cylindrical Bessel function $ J_n(x) $

Return the value of the Beta function of a and b.

template<class T>

T conv ( string s ) [inline]

Convert a int to a string into any type T. Use conv<T>(str)

double erf ( double x ) [inline]

Return the value of the error function: $erf(x) = (2/\sqrt(\pi)) \int_0^x dt \exp(-t^2)$

Create a string from an integer.

Parameters:

	number	: number to be converted
	ndigits	: number of digits; complete at the beginning with "0"s.

template<class T>

Format a number.

Parameters:

	number	: number to be converted
	format	: string containing the c-style printf format.

The user has to check the consistancy of the format and file type sent to the function. No type safety !!!

double gamma ( double x ) [inline]

Return the value of the gamma function: $\Gamma(x) = \int_0^\infty dt t^{x-1} \exp(-t)$

template<class T>

Extract a given field in a string. Default separator is a space. Later versions will improve this.