From: wolf <wolf@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Thu, 6 Sep 2001 16:12:57 +0000 (+0000)
Subject: Wrong, subtract_mean_value was there, but in a different
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=13776eaeb6291992c776686046e78ef000c36640;p=dealii-svn.git

Wrong, subtract_mean_value was there, but in a different
file. Reinstall the declaration.


git-svn-id: https://svn.dealii.org/trunk@4950 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/deal.II/include/numerics/vectors.h b/deal.II/deal.II/include/numerics/vectors.h
index 6e3cb7b0ed..7b97842570 100644
--- a/deal.II/deal.II/include/numerics/vectors.h
+++ b/deal.II/deal.II/include/numerics/vectors.h
@@ -712,6 +712,32 @@ class VectorTools
 				      const NormType        &norm,
 				      const Function<dim>   *weight=0);
 
+				     /**
+				      * Mean-value filter for Stokes.
+				      * The pressure in Stokes'
+				      * equations with only Dirichlet
+				      * boundaries for the velocities
+				      * is determined up to a constant
+				      * only. This function allows to
+				      * subtract the mean value of the
+				      * pressure. It is usually called
+				      * in a preconditioner and
+				      * generates updates with mean
+				      * value zero. The mean value is
+				      * understood in the l1-sense.
+				      *
+				      * Apart from the vector @p{v} to
+				      * operate on, this function
+				      * takes a bit vector. This has a
+				      * true entry for every component
+				      * for which the mean value shall
+				      * be computed and later
+				      * subtracted.
+				      */
+//TODO:[GK] Implementation of subtract_mean_value is missing.    
+    static void subtract_mean_value(Vector<double>          &v,
+				    const std::vector<bool> &p_select);
+    
 				     /**
 				      * Compute the mean value of one
 				      * component of the solution.