# pdecont

Shorthand command for contour plot

This page describes the legacy workflow. New features might not be compatible with the legacy workflow.

## Syntax

pdecont(p,t,u)
pdecont(p,t,u,n)
pdecont(p,t,u,v)
h = pdecont(p,t,u)
h = pdecont(p,t,u,n)
h = pdecont(p,t,u,v)

## Description

pdecont(p,t,u) draws 10 level curves of the PDE node or triangle data u. h = pdecont(p,t,u) additionally returns handles to the drawn axes objects.

If u is a column vector, node data is assumed. If u is a row vector, triangle data is assumed.

The geometry of the PDE problem is given by the mesh data p and t. For details on the mesh data representation, see Mesh Data.

pdecont(p,t,u,n) plots using n levels.

pdecont(p,t,u,v) plots using the levels specified by v.

This command is just shorthand for the call

pdeplot(p,[],t,'XYData',u,'XYStyle','off','Contour',...
'on','Levels',n,'ColorBar','off');

If you want to have more control over your contour plot, use pdeplot instead of pdecont.

## Examples

collapse all

Plot the contours of the solution to the equation $-\Delta u=1$ over the geometry defined by the L-shaped membrane. Use Dirichlet boundary conditions $u=0$ on $\partial \Omega$.

[p,e,t] = initmesh('lshapeg');
[p,e,t] = refinemesh('lshapeg',p,e,t);
u = assempde('lshapeb',p,e,t,1,0,1);
pdecont(p,t,u)