global_ocean.90x40x15/diags_matlab/nanmean.m

function y = nanmean(x)
%NANMEAN Average or mean ignoring NaNs.
%   NANMEAN(X) returns the average treating NaNs as missing values.  
%   For vectors, NANMEAN(X) is the mean value of the non-NaN
%   elements in X.  For matrices, NANMEAN(X) is a row vector
%   containing the mean value of each column, ignoring NaNs.
%
%   See also NANMEDIAN, NANSTD, NANMIN, NANMAX, NANSUM.

%   Copyright 1993-2000 The MathWorks, Inc. 
%   $Revision: 1.1 $  $Date: 2002/10/22 13:30:40 $

if isempty(x) % Check for empty input.
    y = NaN;
    return
end

% Replace NaNs with zeros.
nans = isnan(x);
i = find(nans);
x(i) = zeros(size(i));

if min(size(x))==1,
  count = length(x)-sum(nans);
else
  count = size(x,1)-sum(nans);
end

% Protect against a column of all NaNs
i = find(count==0);
count(i) = ones(size(i));
y = sum(x)./count;
y(i) = i + NaN;
1	function y = nanmean(x)
2	%NANMEAN Average or mean ignoring NaNs.
3	% NANMEAN(X) returns the average treating NaNs as missing values.
4	% For vectors, NANMEAN(X) is the mean value of the non-NaN
5	% elements in X. For matrices, NANMEAN(X) is a row vector
6	% containing the mean value of each column, ignoring NaNs.
7	%
8	% See also NANMEDIAN, NANSTD, NANMIN, NANMAX, NANSUM.
9
10	% Copyright 1993-2000 The MathWorks, Inc.
11	% $Revision: 1.1 $ $Date: 2002/10/22 13:30:40 $
12
13	if isempty(x) % Check for empty input.
14	y = NaN;
15	return
16	end
17
18	% Replace NaNs with zeros.
19	nans = isnan(x);
20	i = find(nans);
21	x(i) = zeros(size(i));
22
23	if min(size(x))==1,
24	count = length(x)-sum(nans);
25	else
26	count = size(x,1)-sum(nans);
27	end
28
29	% Protect against a column of all NaNs
30	i = find(count==0);
31	count(i) = ones(size(i));
32	y = sum(x)./count;
33	y(i) = i + NaN;