Hello

It’s been a while since I’ve posted a question

Recently, while exploring the legacy DOLFIN code, I came across the `MeshCoordinates()`

function.

From posts ref1 and ref2, I thought it was a way to express the coordinate position of a declared mesh.

I ran a simple code with my Jupyter notebook,

```
from dolfin import * # version: 2019.1.0
lx, ly = 1.0, 1.0
elx, ely = 5, 5
msh = RectangleMesh(Point(0, 0), Point(lx, ly), elx, ely, diagonal="crossed")
x0, x1 = MeshCoordinates(msh)
print("x[0]: ", x0)
print("x[1]: ", x1)
```

the output was

```
x0: f_3[0]
x1: f_3[1]
```

The properties for the variables `x0`

, `x1`

were as follows,

```
x0: Indexed(Coefficient(FunctionSpace(Mesh(VectorElement(FiniteElement('Lagrange', triangle, 1), dim=2), 0), VectorElement(FiniteElement('Lagrange', triangle, 1), dim=2)), 3), MultiIndex((FixedIndex(0),)))
x1: Indexed(Coefficient(FunctionSpace(Mesh(VectorElement(FiniteElement('Lagrange', triangle, 1), dim=2), 0), VectorElement(FiniteElement('Lagrange', triangle, 1), dim=2)), 3), MultiIndex((FixedIndex(1),)))
```

but it was hard to visually figure out what values they represented, hence the posting question.

My questions are:

a) What should I understand about the output of this function?

(`MeshCoordinate(msh)`

seems to hold a lot of information.)

b) And in `dolfinx`

, what is the function that does the same thing as `MeshCoordinates()`

?

(Does this do the same thing as the `tabulate_dof_coordinates()`

function? )