HypergeometricU
HypergeometricU[a,b,z]
is the Tricomi confluent hypergeometric function .
Details
- Mathematical function, suitable for both symbolic and numerical manipulation.
- The function has the integral representation .
- HypergeometricU[a,b,z] has a branch cut discontinuity in the complex plane running from to .
- For certain special arguments, HypergeometricU automatically evaluates to exact values.
- HypergeometricU can be evaluated to arbitrary numerical precision.
- HypergeometricU automatically threads over lists.
- HypergeometricU can be used with Interval and CenteredInterval objects. »
Examples
open allclose allBasic Examples (5)
Plot over a subset of the reals:
Plot over a subset of the complexes:
Series expansion at the origin:
Series expansion at Infinity:
Scope (39)
Numerical Evaluation (5)
The precision of the output tracks the precision of the input:
Evaluate for complex arguments:
Evaluate HypergeometricU efficiently at high precision:
Compute worst-case guaranteed intervals using Interval and CenteredInterval objects:
Or compute average-case statistical intervals using Around:
Compute the elementwise values of an array:
Or compute the matrix HypergeometricU function using MatrixFunction:
Specific Values (3)
HypergeometricU automatically evaluates to simpler functions for certain parameters:
Visualization (3)
Plot the HypergeometricU function:
Plot HypergeometricU as a function of its second parameter:
Function Properties (9)
Real domain of HypergeometricU:
Complex domain of HypergeometricU:
is neither non-decreasing nor non-increasing on its real domain:
is positive on its real domain:
has both singularity and discontinuity for z≤0:
TraditionalForm formatting:
Differentiation (3)
Integration (3)
Series Expansions (3)
Series expansion for HypergeometricU:
Plot the first three approximations for around :
Expand HypergeometricU in series around infinity:
Apply HypergeometricU to a power series:
Integral Transforms (3)
Function Representations (5)
Representation through Gamma and Hypergeometric1F1:
HypergeometricU can be represented in terms of MeijerG:
HypergeometricU can be represented as a DifferentialRoot:
TraditionalForm formatting:
Applications (3)
Solve the confluent hypergeometric differential equation:
Borel summation of the divergent series for the function gives HypergeometricU:
The same result can be obtained using the Regularization option of Sum:
Define distribution for scaled condition number of a WishartMatrixDistribution:
Sample the scaled condition number of a large matrix and check that it agrees with asymptotic closed-form distribution:
The asymptotic scaled condition number distribution has infinite mean:
Properties & Relations (4)
Use FunctionExpand to expand HypergeometricU into simpler functions:
Integrate may give results involving HypergeometricU:
HypergeometricU can be represented as a DifferentialRoot:
HypergeometricU can be represented as a DifferenceRoot:
Possible Issues (1)
The default setting of $MaxExtraPrecision can be insufficient to obtain requested precision:
A larger setting for $MaxExtraPrecision may be needed:
Text
Wolfram Research (1988), HypergeometricU, Wolfram Language function, https://reference.wolfram.com/language/ref/HypergeometricU.html (updated 2022).
CMS
Wolfram Language. 1988. "HypergeometricU." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2022. https://reference.wolfram.com/language/ref/HypergeometricU.html.
APA
Wolfram Language. (1988). HypergeometricU. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/HypergeometricU.html