Using XY Data from this example? Help please

What I mean is I am running the following example:

openExample('pde/StressConcentrationInPlateWithCircularHoleExample')

I'll keep it simple: can someone explain how I extract the XY Data?

I am trying to write a function that will receive an XY position to test, and return the relevant values at that position in the solution plot, such as for Von Mises stress at that XY position. However the model doesn't seem to have a readily available vector or matrix of corresponding XY values, and 'XYdata' looks like a special call to model, so not necessarily stored in the format useful to what I am doing.

"At [4.6783, 10.4534], what is the stress in the X-direction?" etc.

Answer 1

[Ravi Kumar]

You can use interpolateStress to find values of stress at a given query coordinates (xq,yq,zq),.

Regards,

Ravi

[Jonathan Charron]

Ah! Yes, I think this is the type of function I was fearful I was going to have to engineer myself. Thank you so much.

Answer 2

[Walter Roberson]

After the call to

geometryFromEdges(model,g);

then

model.Geometry.Vertices

will give you the initial geometric coordinates as an 8 x 2 array.

After the call to

generateMesh(model,'Hmax',radius/6);

then

model.Mesh.Nodes

will be a 2 x 16048 array of coordinates, and

model.Mesh.Elements

will be a 6 x 7856 array of integers, minimum value 1 and maximum value 16048 -- so we can tell that those are indices into the model.Mesh.Nodes array.

[Jonathan Charron]

What I'm looking to do is query "what is the stress etc. at [199.9, -49.7] etc."

Node n1 is at 200, -50

Node n5761 is at 200, -48.3 (approx)

Node n5557 is at 198.3, -48.8 (approx)

The three make up 1 element/face with a stress/value gradient on it. It is not accurate enough to approximate to the closest node, or edge, or take the average of the element, and the elements are not made up of node numbers in sequence.

[Walter Roberson]

Ah, but what you asked for is to extract the XY Data. Ravi's solution is what you probably really want.

[Jonathan Charron]

To be fair, I'm probably confused about what I really want :D