MathieuCharacteristicA

MathieuCharacteristicA[r,q]

gives the characteristic value for even Mathieu functions with characteristic exponent r and parameter q.

Details

  • Mathematical function, suitable for both symbolic and numerical manipulation.
  • The characteristic value gives the value of the parameter in for which the solution has the form , where is an even function of with period .
  • For certain special arguments, MathieuCharacteristicA automatically evaluates to exact values.
  • MathieuCharacteristicA can be evaluated to arbitrary numerical precision.
  • MathieuCharacteristicA automatically threads over lists.

Examples

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Basic Examples  (3)

Evaluate numerically:

Plot over a subset of the reals:

Plot over a subset of the complexes:

Scope  (16)

Numerical Evaluation  (4)

Evaluate numerically:

Evaluate to high precision:

The precision of the output tracks the precision of the input:

Complex number inputs:

Evaluate efficiently at high precision:

Specific Values  (2)

Simple exact values are generated automatically:

Find the positive maximum of MathieuCharacteristicA[2,q ]:

Visualization  (3)

Plot the MathieuCharacteristicA function for integer parameters:

Plot the MathieuCharacteristicA function for noninteger parameters:

Plot the real part of MathieuCharacteristicA:

Plot the imaginary part of MathieuCharacteristicA:

Function Properties  (7)

The real domain of MathieuCharacteristicA:

Approximate function range of TemplateBox[{1, x}, MathieuCharacteristicA]:

TemplateBox[{1, x}, MathieuCharacteristicA] is a continuous function of :

TemplateBox[{1, x}, MathieuCharacteristicA] is neither non-increasing nor non-decreasing:

TemplateBox[{1, x}, MathieuCharacteristicA] is not injective:

MathieuCharacteristicA threads elementwise over lists:

TraditionalForm formatting:

Applications  (4)

Symmetric periodic solutions of the Mathieu differential equation:

This shows the stability diagram for the Mathieu equation:

As a function of the first argument, MathieuCharacteristicA is a piecewise continuous function (called bands and band gaps in solid state physics):

Solve the Laplace equation in an ellipse using separation of variables:

This finds a zero:

This plots an eigenfunction. It vanishes at the ellipse boundary:

Properties & Relations  (1)

MathieuCharacteristicA is a special case of SpheroidalEigenvalue:

Neat Examples  (1)

Branch points of the Mathieu characteristic along the imaginary q axis:

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