geomean2.m

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function [gm]=geomean2(y, dim)
% % geomean2: Calculates the geometric mean
% %
% % Syntax:
% %
% % [gm]=geomean2(y);
% %
% % ********************************************************************
% %
% % Description
% %
% % This program calculates the geometric mean, if all of the data are
% % greater than zero; otherwise, the progrma caculates the
% % arithmetic mean.
% %
% %
% % ********************************************************************
%
% Example='1';
%
% y=rand(1, 100000);    % y is the data array
%                       % y can be multidimensional
%
% [gm]=geomean2(y);
% %
% % Output Variables
% % gm is the mean
% %
% %
% %
% % *********************************************************************
% %
% % Program Written by Edward L. Zechmann
% %
% %     date 16 December 2007
% %
% % modified 27 December    2007   Added a description and an example
% %                                Updated comments.
% %
% % modified  7 January     2009   Updated comments.
% %
% % *********************************************************************
% %
% % Please feel free to modify this code.
% %


flag2=0;

if nargin < 1 || isempty(y) || ~isnumeric(y)
    y=[];
    gm=[];
    flag2=1;
end

if isequal(flag2, 0)
    flag1=0;
    if nargin < 2 || isempty(dim) || ~isnumeric(dim)
        dim=[];
        flag1=1;
    end

    dim=round(dim);

    if isequal(flag1, 1)

        boolean1=any(min(y <= 0));

        if boolean1
            gm=mean(y, []);
        else
            bb=prod(y);
            gm=bb.^(1./(numel(y)/numel(bb)));
        end

    else

        boolean1=any(min(y <= 0, dim));

        if dim > ndims(y)
            gm=y;
        else

            if boolean1
                gm=mean(y, [], dim);
            else
                gm=prod(y, dim).^(1./size(y, dim));
            end
        end

    end
end