InitialSeeding

InitialSeeding

is an option for NDSolve and other functions that specifies equations that specify initial seeding values for variables that may be used by iterative algorithms.

Details

  • For differential algebraic equations in NDSolve and other functions, InitialSeeding->{u[t0]==val} indicates that the numerical value val should be used to start finding consistent initial conditions.
  • For stationary nonlinear partial differential equations in NDSolve and other functions, InitialSeeding->{u[x1,]==fun[x1,]} indicates the numerical function fun of the independent variables x1, should be used to get a starting vector on the mesh.
  • Different initial seeding values may lead to different solutions. »

Examples

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Basic Examples  (1)

Specify an initial seeding of 0 for a boundary value problem:

Scope  (7)

Specify an initial seeding that depends on a spatial coordinate:

Use the solution of a linear boundary value problem as the initial seeding for a nonlinear boundary value problem:

Different settings for InitialSeeding can lead to different solutions of boundary value problems:

Specify a different value for the StartingGuess:

Specify a complex-valued initial seed:

Find a solution to a boundary value problem:

Find a different solution by specifying a different setting for InitialSeeding:

Give different initial seedings for the "Shooting" method for a nonlinear boundary value problem:

With the "Shooting" method, initial seeding can also be given inside of the solution interval:

Use InitialSeeding that is used to find consistent initial conditions for a system of differential algebraic equations:

Possible Issues  (2)

For certain DAE systems, a message about inconsistent initial condition may be issued if no initial seeding is specified:

Provide an initial condition seeding to get consistent initial conditions:

Different initial seeding values can lead to different results for DAE systems:

Specify a different starting guess:

Wolfram Research (2019), InitialSeeding, Wolfram Language function, https://reference.wolfram.com/language/ref/InitialSeeding.html.

Text

Wolfram Research (2019), InitialSeeding, Wolfram Language function, https://reference.wolfram.com/language/ref/InitialSeeding.html.

CMS

Wolfram Language. 2019. "InitialSeeding." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/InitialSeeding.html.

APA

Wolfram Language. (2019). InitialSeeding. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/InitialSeeding.html

BibTeX

@misc{reference.wolfram_2021_initialseeding, author="Wolfram Research", title="{InitialSeeding}", year="2019", howpublished="\url{https://reference.wolfram.com/language/ref/InitialSeeding.html}", note=[Accessed: 07-December-2021 ]}

BibLaTeX

@online{reference.wolfram_2021_initialseeding, organization={Wolfram Research}, title={InitialSeeding}, year={2019}, url={https://reference.wolfram.com/language/ref/InitialSeeding.html}, note=[Accessed: 07-December-2021 ]}