findInitialConditions
Locate active initial conditions
Description
returns the active initial condition assignment ic
= findInitialConditions(ics
,RegionType
,RegionID
)ic
for the
initial conditions in the specified region.
Examples
Find the Active Initial Conditions
This example shows find the active initial conditions for a region.
Create a PDE model that has a few subdomains.
model = createpde(); geometryFromEdges(model,@lshapeg); pdegplot(model,"FaceLabels","on") ylim([-1.1,1.1]) axis equal
Set initial conditions on each pair of regions.
setInitialConditions(model,12,"Face",[1,2]); setInitialConditions(model,13,"Face",[1,3]); setInitialConditions(model,23,"Face",[2,3]);
Check the initial conditions specification for region 1.
ics = model.InitialConditions;
ic = findInitialConditions(ics,"Face",1)
ic = GeometricInitialConditions with properties: RegionType: 'face' RegionID: [1 3] InitialValue: 13 InitialDerivative: []
Input Arguments
ics
— Model initial conditions
InitialConditions
property of a PDE model
Model initial conditions, specified as the
InitialConditions
property of a PDE model. Initial
conditions can be complex numbers.
Example: model.InitialConditions
RegionType
— Geometric region type
"Edge"
for a 2-D model | "Face"
for a 2-D model or 3-D model | "Cell"
for a 3-D model
Geometric region type, specified as "Edge"
for a 2-D
model, "Face"
for a 2-D model or 3-D model, or
"Cell"
for a 3-D model.
Example: ca =
findInitialConditions(ics,"Face",[1,3])
Data Types: char
| string
RegionID
— Region ID
vector of positive integers
Region ID, specified as a vector of positive integers. View the subdomain
labels for a 2-D model using
pdegplot(model,"FaceLabels","on")
. Currently, there
are no subdomains for 3-D models, so the only acceptable value for a 3-D
model is 1
.
Example: ca =
findInitialConditions(ics,"Face",[1,3])
Data Types: double
Output Arguments
ic
— Initial condition assignment
GeometricInitialConditions
object | NodalInitialConditions
object
Initial condition assignment, returned as a GeometricInitialConditions Properties or NodalInitialConditions Properties object.
Version History
Introduced in R2016a
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