findCoefficients

R2026b

Locate active PDE coefficients

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Syntax

CA = findCoefficients(coeffs,RegionType=RegionID)

Description

CA = findCoefficients(coeffs,RegionType=RegionID) returns the active coefficient assignment CA for the coefficients in the specified region.

example

Examples

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Open Live Script

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

Figure contains an axes object. The axes object contains 4 objects of type line, text.

Set coefficients on each pair of regions.

specifyCoefficients(model,m=0,d=0,c=12,a=0,f=1,Face=[1,2]);
specifyCoefficients(model,m=0,d=0,c=13,a=0,f=2,Face=[1,3]);
specifyCoefficients(model,m=0,d=0,c=23,a=0,f=3,Face=[2,3]);

Check the coefficient specification for region 1.

coeffs = model.EquationCoefficients;
ca = findCoefficients(coeffs,Face=1)
ca = 
  CoefficientAssignment with properties:

    RegionType: 'face'
      RegionID: [1 3]
             m: 0
             d: 0
             c: 13
             a: 0
             f: 2

Input Arguments

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Model coefficients, specified as the EquationCoefficients property of a PDE model. Coefficients can be complex numbers.

Example: model.EquationCoefficients

Geometric region type, specified as Face for a 2-D model, or Cell for a 3-D model.

Example: ca = findCoefficients(coeffs,Face=[1,3])

Data Types: char | string

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 = findCoefficients(coeffs,Face=[1,3])

Data Types: double

Output Arguments

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Coefficient assignment, returned as a CoefficientAssignment Properties object.

Version History

Introduced in R2016a

See Also

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