pdegplot
Plot PDE geometry
Description
pdegplot(
plots with additional options specified by one or more name-value arguments. For
example, you can specify whether to display vertex, edge, face, and cell
labels.g,Name,Value)
In R2026a: pdegplot( plots the
geometry in target axes, using any of the previous syntaxes.ax,___)
h = pdegplot(___)
Examples
Plot the geometry of a region defined by a few simple shapes.
g = [2 1 1 1 1 1 1 1 1 4 4;
-1 -0.6 -0.5 -0.4 -0.5 0.4 0.5 0.6 0.5 -1 0.17;
1 -0.5 -0.4 -0.5 -0.6 0.5 0.6 0.5 0.4 0.17 1;
0 -0.25 -0.35 -0.25 -0.15 -0.25 -0.35 -0.25 -0.15 0 -0.74;
0 -0.35 -0.25 -0.15 -0.25 -0.35 -0.25 -0.15 -0.25 -0.74 0;
0 0 0 0 0 0 0 0 0 1 1;
1 1 1 1 1 1 1 1 1 0 0;
0 -0.5 -0.5 -0.5 -0.5 0.5 0.5 0.5 0.5 0 0;
0 -0.25 -0.25 -0.25 -0.25 -0.25 -0.25 -0.25 -0.25 0 0;
0 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 1 1;
0 0 0 0 0 0 0 0 0 0.75 0.75;
0 0 0 0 0 0 0 0 0 0 0];
pdegplot(g)
View the vertex labels, edge labels, and the face label. Add space at the top of the plot to see the top edge clearly.
pdegplot(g,VertexLabels="on", ... EdgeLabels="on", ... FaceLabels="on") ylim([-.8,.1])
Import a 3-D geometry file. Plot the geometry and turn on face labels. To see the labels on all faces of the geometry, set the transparency to 0.5.
gm = fegeometry("BracketWithHole.stl"); pdegplot(gm,FaceLabels="on",FaceAlpha=0.5)
Import a 3-D geometry file. Plot the geometry and turn on cell labels.
gm = fegeometry("DampingMounts.stl"); pdegplot(gm,CellLabels="on")
Since R2023b
Create and plot a 3-D geometry consisting of three nested cuboids of the same height. By default, pdegplot uses lighting effects to display geometric features, like different cells, with more contrast.
gm = multicuboid([2 3 5],[4 6 10],3);
pdegplot(gm,CellLabels="on",FaceAlpha=0.3)
To obtain the same plot appearance as in R2023a or earlier, turn off the lighting effects.
figure pdegplot(gm,CellLabels="on",FaceAlpha=0.3,Lighting="off")
Since R2025a
Create a plot showing a watercolor paint set with two rows, each containing three pans of paint. First, create the geometry representing the container for the paint set.
L = 0.6; W = 0.4; H = 0.05; g = multicuboid(W,L,H); g = fegeometry(translate(g,[0,L/2,0]));
Create the geometry representing an individual pan of paint.
gPan = fegeometry(multicylinder(W/6,H/2));
Create a vector containing the colors you want to use for the six pans of paint. For example, specify these colors.
color = ["red","green","blue","yellow","magenta","black"];
Specify the gap from the edge of the container to the first pan.
edgeGap = 0.1;
Plot the container and specify white as the face color. Use the vector color to specify the face colors for the pans of paint.
pdegplot(g,FaceColor="white") hold on i = 1; for k=linspace(edgeGap,L-edgeGap,3) % 3 pans in a row gColor = translate(gPan,[edgeGap,k,1.01*H/2]); pdegplot(gColor,FaceColor=color(i)) hold on i = i + 1; % Mirror the geometry to create a pan in the second row. gColor = scale(gColor,[-1 1 1]); pdegplot(gColor,FaceColor=color(i)) hold on i = i + 1; end
Since R2026a
Position two Axes objects in a figure and add a geometry plot to each one.
Specify the position of the first Axes object so that it has a lower left corner at the point (0.1 0.1) with a width and height of 0.7. Specify the position of the second Axes object so that it has a lower left corner at the point (0.65 0.65) with a width and height of 0.28. By default, the values are normalized to the figure. Return the Axes objects as ax1 and ax2.
ax1 = axes(Position=[0.1 0.1 0.7 0.7]); ax2 = axes(Position=[0.65 0.65 0.28 0.28]);
Add a geometry plot to each Axes object. Specify the axes by passing it as the first input argument to the pdegplot function.
pdegplot(ax1,@cardg) pdegplot(ax2,@circleg)
Input Arguments
Name-Value Arguments
Output Arguments
Alternative Functionality
App
If you create a 2-D geometry in the PDE Modeler app, you can view the geometry from Boundary Mode. To see the edge labels, select Boundary > Show Edge Labels. To see the face labels, select PDE > Show Subdomain Labels.
