global_ocean.128x64x15/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	cnh	1.1	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;