esys-escript

How to get the Function space from the Data object

Asked by hhh_Chen

Hi everyone,

Can I get the Function space from the Data object representing the same region in one geometry. For example, I get the Data object region y>2. from

x=Function(mydomain).getX()
region=wherePositive(x[1]-2.)

How can I get the Function space of y>2. from region?

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Lutz Gross
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Lutz Gross (l-gross) said : 		#1

I am not sure I understand your question correctly but you can get the associated function space by

    region.getFunctionSpace()

As function space is passed through expression on you should have

    assert region.getFunctionSpace() == Function(mydomain)

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hhh_Chen (chenlifan) said : 		#2
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hhh_Chen (chenlifan) said : 		#3

Thanks, Lutz Gross.

I have tried the expression before

region.getFunctionSpace().getX().toListOfTuples()

but it returns the whole function space of mydomain instead of the one y>2. Is it possible to get the function space of y>2. by an expression with region?

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Best Lutz Gross (l-gross) said : 		#4

In first instance the term 'function space' refers to a way values are stored not to a certain spatial region. I need to admit that the name is a bit misleading. Hence region.getFunctionSpace() return the same function space as x.getFunctionSpace().
The best way to deal with this subregion depends on what you want to do. If you solve a PDE you can just black the y>=2. region using q.

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hhh_Chen (chenlifan) said : 		#5

Thanks Lutz Gross, that solved my question.