Returns the
function, also known as
the trigamma function.
Namespace: Imsl.MathAssembly: ImslCS (in ImslCS.dll) Version: 6.5.2.0
Syntax public static double Psi1(
double x
)
Public Shared Function Psi1 (
x As Double
) As Double
public:
static double Psi1(
double x
)
static member Psi1 :
x : float -> float
Parameters
- x
- Type: SystemDouble
A double value, the point at which the trigamma function is
to be evaluated.
Return Value
Type:
Double
A
double value specifying the trigamma function of
x. If
x is a negative integer
or zero, the result is
NaN.
Remarks The trigamma function, , is
defined to be
The trigamma function is not defined for integers less than
or equal to zero.
See Also