On Mon, 19 Dec 2011, Ataollah Mesgarnejad wrote:

> Here is something that I don't understand? What is the 4th argument
> for? The way I think about it is that this works like
> System::project_solution and function ptr (argument 1) has the
> variable name ?

project_solution assume that you're projecting fptr/gptr onto
System::solution.  project_vector lets you hand in any NumericVector
that's been initialized for the current System.

All variables are projected into the vector.  It's up to your
implementation of fptr (and gptr if you're using a C1 FE space) to
make sure it returns the right variable's results for any variable
requested.
---
Roy

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