JacobiCS

JacobiCS[u,m]

gives the Jacobi elliptic function .

Details

  • Mathematical function, suitable for both symbolic and numerical manipulation.
  • , where .
  • is a doubly periodic function in u with periods and , where is the elliptic integral EllipticK.
  • JacobiCS is a meromorphic function in both arguments.
  • For certain special arguments, JacobiCS automatically evaluates to exact values.
  • JacobiCS can be evaluated to arbitrary numerical precision.
  • JacobiCS automatically threads over lists.

Examples

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Basic Examples  (5)

Evaluate numerically:

Plot the function over a subset of the reals:

Plot over a subset of the complexes:

Series expansions at the origin:

Series expansion at a singular point:

Scope  (27)

Numerical Evaluation  (4)

Evaluate numerically to high precision:

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

Evaluate for complex arguments:

Evaluate JacobiCS efficiently at high precision:

JacobiCS threads elementwise over lists:

Specific Values  (3)

Simple exact values are generated automatically:

Some poles of JacobiCS:

Find a zero of TemplateBox[{x, {1, /, 3}}, JacobiCS]:

Visualization  (3)

Plot the JacobiCS functions for various parameter values:

Plot JacobiCS as a function of its parameter :

Plot the real part of TemplateBox[{{x, +, {ⅈ,  , y}}, {1, /, 2}}, JacobiCS]:

Plot the imaginary part of TemplateBox[{{x, +, {ⅈ,  , y}}, {1, /, 2}}, JacobiCS]:

Function Properties  (2)

JacobiCS is 2 TemplateBox[{m}, EllipticK]-periodic along the real axis:

JacobiCS is 4ⅈTemplateBox[{{1, -, m}}, EllipticK]-periodic along the imaginary axis:

JacobiCS is an odd function:

Differentiation  (3)

First derivative:

Higher derivatives:

Plot higher derivatives for :

Derivative with respect to :

Integration  (3)

Indefinite integral of JacobiCS:

Definite integral of an odd function over the interval centered at the origin is 0:

More integrals:

Series Expansions  (3)

Series expansion for TemplateBox[{x, {1, /, 3}}, JacobiCS]:

Plot the first three approximations for TemplateBox[{x, {1, /, 3}}, JacobiCS] around :

Taylor expansion for TemplateBox[{1, m}, JacobiCS]:

Plot the first three approximations for TemplateBox[{1, m}, JacobiCS] around :

JacobiCS can be applied to a power series:

Function Identities and Simplifications  (3)

Primary definition:

Parity transformation and periodicity relations are automatically applied:

Automatic argument simplifications:

Function Representations  (3)

Representation in terms of Cot of JacobiAmplitude:

Relation to other Jacobi elliptic functions:

TraditionalForm formatting:

Applications  (4)

Hierarchy of solutions of the nonlinear diffusion equation :

Check:

Flow lines in a rectangular region with a current flowing from the lowerright to the upperleft corner:

Conformal map from a unit triangle to the unit disk:

Show points before and after the map:

Solution of the sinhGordon equation :

Check the solution:

Plot the solution:

Properties & Relations  (2)

Compose with inverse functions:

Use PowerExpand to disregard multivaluedness of the inverse function:

Solve a transcendental equation:

Possible Issues  (2)

Machine-precision input is insufficient to give the correct answer:

Currently only simple simplification rules are built in for Jacobi functions:

Introduced in 1988
 (1.0)