Update a CoefficientFunction defined in terms of GridFunctions

General
1

Is it possible to update the values of a CoefficientFunction defined in terms of some GridFunctions if such GridFunctions change?

2

There is no need for update - the evaluation of a CoefficientFunction always takes the current values of a GridFunction

Or, do you want to replace the GridFunction by another GridFunction ?

3

Thank you for getting back to me. Consider the following simple scenario

Vh = H1(mesh, order = order, dgjumps = True) #FE space
yh = GridFunction(Vh)
yh.Set(x+y)
g11 = yh + sin(yh) #CoefficientFunction in terms of yh

I am wondering whether updating the value of yh automatically updates the values of g11. Think, for instance, about yh being updated after each Newton iteration. To be more precised, suppose I have another GridFunction ysub and I do

yh.vec.data = y_sub.vec

Does this automatically update g11?

4

yes, it does.

g11 does not store its own big data, it stores only the expression tree of its definition, which contains the pointers to yh

1 Like
5

Thanks! Great to know!

I suppose that is still the case if immediately after defining g11 I do g11.Compile(). Is that correct?