JacobiDS

gives the Jacobi elliptic function .

Details

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

Examples

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Basic Examples (4)

Evaluate numerically:

Plot the function over a subset of the reals:

Plot over a subset of the complexes:

Series expansions at the origin:

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 JacobiDS efficiently at high precision:

JacobiDS threads elementwise over lists:

Specific Values (3)

Simple exact values are generated automatically:

Some poles of JacobiDS:

Find a local minimum of JacobiDS as a root of :

Visualization (3)

Plot the JacobiDS functions for various parameter values:

Plot JacobiDS as a function of its parameter :

Plot the real part of :

Plot the imaginary part of :

Function Properties (2)

JacobiDS is -periodic along the real axis:

JacobiDS is -periodic along the imaginary axis:

JacobiDS is an odd function:

Differentiation (3)

First derivative:

Higher derivatives:

Plot higher derivatives for :

Derivative with respect to :

Integration (3)

Indefinite integral of JacobiDS:

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

More integrals:

Series Expansions (3)

Series expansion for :

Plot the first three approximations for around :

Taylor expansion for :

Plot the first three approximations for around :

JacobiDS can be applied to a power series:

Function Identities and Simplifications (3)

Parity transformation and periodicity relations are automatically applied:

Identity involving JacobiCS:

Argument simplifications:

Function Representations (3)

Representation in terms of Csc of JacobiAmplitude:

Relation to other Jacobi elliptic functions:

TraditionalForm formatting:

Applications (4)

Conformal map from a rectangle to the unit disk:

Visualize the map:

Generator for the hierarchy of solutions of the nonlinear diffusion equation :

Numerical check of the solutions:

Conformal map from an ellipse to the unit disk:

Visualize the map:

Cartesian coordinates of a pendulum:

Plot the time‐dependence of the coordinates:

Plot the trajectory:

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:

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