contour plots on a given geometry - finite element

I have some values of stretch that I need to assign to a given set of elements and then I want to show a contour plot of those values on the geometry that I get by plotting the elements through the nodes. How can I do?

[Mathieu NOE]

so I guessed it is a 2D problem

your geometry is defined by x,y data and your stretch data can be used as z values

if you have those x,y,z data as vectors (scattered data) then you can use this method to create your contour plot

Contour Plot for Scattered Data - File Exchange - MATLAB Central (mathworks.com)

[Federica]

I have n-values for stretch and n corresponding centroids to assign that value. how can I create a contour plot?

[Mathieu NOE]

can you share the data ?

Answer 1

[Arun]

Hi Federica,

I understand that you have n-values for both stretch and corresponding centroids and wish to create a contour plot for the available data.

Following steps might be useful to achieve the required plot:

1. Create a grid that covers the range of the centroid coordinates:

[X, Y] = meshgrid(centroid(x),centroid(y));

2. Create the Contour Plot using “contour” function:

contour(X, Y, corresponding values);

Here is an example code for plotting contour plot:

centroid = [linspace(-2*pi,2*pi); linspace(0,4*pi)]';
[X1,Y1] = meshgrid(centroid(:,1),centroid(:,2));
stretch = sin(X1)+ cos(Y1);
contour(X1,Y1,stretch)

For more information related to contour plot please refer the shared MATLAB documentation link: https://www.mathworks.com/help/matlab/ref/contour.html

Hope this helps.