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ElementMarkers[m]

returns markers of a mesh element m.

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Basic Examples  
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NDSolve`FEM`
NDSolve`FEM`

ElementMarkers

ElementMarkers[m]

returns markers of a mesh element m.

Details and Options

Examples

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Basic Examples  (1)

Load the package:

Wolfram Language code: <<NDSolve`FEM`

ElementMarkers returns markers present in mesh elements of an ElementMesh:

Wolfram Language code: ElementMarkers[ToElementMesh[Rectangle[]]["BoundaryElements"]]//Short

Possible Issues  (1)

ElementMarkers is a function to extract markers from mesh elements. ElementMarker is a symbol used to address these markers in partial differential equations or boundary conditions.

Create a mesh:

Wolfram Language code: mesh = ToElementMesh["Coordinates" -> {{1.293, 0.228}, {1., 0.}, {0.94, 0.342}, {1.293, 0.}, {1.215, 0.442}, {2., 0.}, {1.879, 0.684}}, "MeshElements" -> {TriangleElement[{{1, 3, 2}, {1, 2, 4}, {1, 4, 6}, {1, 6, 7}, {1, 7, 5}, {1, 5, 3}}, {66, 66, 66, 44, 44, 44}]}, "BoundaryElements" -> {LineElement[{{3, 2}, {1, 3}, {2, 4}, {4, 6}, {6, 1}, {6, 7}, {7, 5}, {5, 3}}, {11, 22, 33, 33, 22, 44, 55, 55}]}, "PointElements" -> {PointElement[{{1}, {2}, {3}, {4}, {5}, {6}, {7}}, {1, 2, 2, 3, 3, 4, 4}]}]

Visualize the mesh with markers in the "MeshElements" in blue, the markers in the "BoundaryElements" in red and the markers in the "PointElements" in brown:

Wolfram Language code: Show[ mesh["Wireframe"], mesh["Wireframe"["MeshElementMarkerStyle" -> Blue]], mesh["Wireframe"["MeshElement" -> "BoundaryElements", "MeshElementMarkerStyle" -> Red]], mesh["Wireframe"["MeshElement" -> "PointElements", "MeshElementMarkerStyle" -> Brown]] ]

Extract the point element markers from the point elements:

Wolfram Language code: ElementMarkers[mesh["PointElements"]]

Set Dirichlet conditions by using the ElementMarker symbol:

Wolfram Language code: solution = NDSolveValue[{Laplacian[u[x, y], {x, y}] == 1, DirichletCondition[u[x, y] == 0, ElementMarker == 2], DirichletCondition[u[x, y] == 1, ElementMarker == 4]}, u, {x, y}∈mesh]

Visualize the solution:

Wolfram Language code: Plot3D[solution[x, y], {x, y}∈mesh]
Wolfram Research (2021), ElementMarkers, Wolfram Language function, https://reference.wolfram.com/language/FEMDocumentation/ref/ElementMarkers.html.

Text

Wolfram Research (2021), ElementMarkers, Wolfram Language function, https://reference.wolfram.com/language/FEMDocumentation/ref/ElementMarkers.html.

CMS

Wolfram Language. 2021. "ElementMarkers." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/FEMDocumentation/ref/ElementMarkers.html.

APA

Wolfram Language. (2021). ElementMarkers. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/FEMDocumentation/ref/ElementMarkers.html

BibTeX

@misc{reference.wolfram_2026_elementmarkers, author="Wolfram Research", title="{ElementMarkers}", year="2021", howpublished="\url{https://reference.wolfram.com/language/FEMDocumentation/ref/ElementMarkers.html}", note=[Accessed: 28-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_elementmarkers, organization={Wolfram Research}, title={ElementMarkers}, year={2021}, url={https://reference.wolfram.com/language/FEMDocumentation/ref/ElementMarkers.html}, note=[Accessed: 28-June-2026]}