**NAME**

Grid_computeVarNorm

**SYNOPSIS**

call Grid_computeVarNorm(integer(in) :: level, integer(in) :: normType, integer(in) :: ivar, real(out) :: norm, integer(in) :: leafOnly)

**DESCRIPTION**

Computes the L1 or L2 norm of the variable specified by ivar. This can be done per-level, or on leaf or all nodes. For multigrid, the L2 norm is used for convergence, but the L1 norm is incredibly useful for debugging purposes.

**ARGUMENTS**

level - If the norm is restricted to a given level; 0 is all normType - p in the Lp norm where choices of p are 1 or 2 ivar - the grid variable being normed; -1 for work norm - the variable with which to return the norm leafOnly - if this isn't 0, compute the norm only on leaf nodes

**RESULT**

The norm of ivar is in norm.

**EXAMPLE**

gr_restrictTree() do i = 1, lrefine_max call Grid_computeVarNorm(i, 1, pdens, norm(i), 0) enddo do i = 1, lrefine_max if (norm(0) - norm(i) > 0.0000001) then driver_abortFlash("restriction is highly nonconservatory!") endif enddo

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