fv_linfty_error.m

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function linfty_error = fv_linfty_error(U1,U2,W)
%function linfty_error = fv_linfty_error(U1,U2,W)
% compute the infinity-norm error between two Dof vectors.
%
% This function computing the infinity norm error between the two fv-functions
% or function sequences in 'U1,U2': `\|u_1 - u_2\|_{L^\infty(\Omega)}`.
% Actually, the parameters 'grid' and 'params' are currently superfluous, but
% kept for consistency of function line arguments.
%
% parameters:
%  U1 : first vector of Dofs of function `u_1`
%  U2 : second vector of Dofs of function `u_2`
%  W  : superfluous argument kept for compatibility with fv_l2_error().
%
% return values:
%  linfty_error: a single value or sequence of values corresponding to the
%                column-differences between 'U1' and 'U2'

% Bernard Haasdonk 28.2.2008

%  linfty_error = sqrt(sum(((U1-U2).^2).*repmat(grid.A(:),1,size(U1,2))));
linfty_error = max(abs(U1-U2));