function z = gsw_z_from_depth(depth)

% gsw_z_from_depth height, z, from depth
%==========================================================================
%
% USAGE:
% z = gsw_z_from_depth(depth)
%
% DESCRIPTION:
% Calculates height, z, from depth. Note that in general height is
% negative in the ocean.
%
% INPUT:
% depth = depth [ m ]
%
% OUTPUT:
% z = height [ m ]
%
% AUTHOR:
% Winston [ god@teos-10.org ]
%
% VERSION NUMBER: 3.01 (26th March, 2011)
%
% This software is available from http://www.TEOS-10.org
%
%==========================================================================

%--------------------------------------------------------------------------
% Check variables and resize if necessary
%--------------------------------------------------------------------------

if ~(nargin == 1)
error('gsw_z_from_depth: Requires one input')
end %if

%--------------------------------------------------------------------------
% Start of the calculation
%--------------------------------------------------------------------------

z = -depth;

end