finding mean
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I have a 30 matrix of size 256x256 stored in in different variables,
for ex the variables are A,D,R,T,Y,......ETC,EACH variable has same matrix size,now i want to find mean for each matrix and store it s mean values in a separate variable ,please help
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the cyclist
2012-6-12
It's pretty awkward if there is no pattern to the naming of the variables, so if you can fix the naming problem upstream, you should try to do that. If you can't, then one approach is to define a function that takes a variable number of arguments, and does the mean of each one:
function arrayOfMeans = getMeans(varargin)
arrayOfMeans = zeros(nargin,1);
for n=1:nargin
arrayOfMeans(n) = mean(varargin{n}(:)); % Calculating means of all elements in array
end
end
Then call that function with the list of your variables as the input. For example,
>> getMeans(magic(3),rand(7),eye(4))
In your case, you would do
>> getMeans(A,D,R,T)
etc
更多回答（2 个）
Walter Roberson
2012-6-12
1 个投票
Andrei Bobrov
2012-6-13
a = whos;
b = strcat({a(cellfun(@(x)isequal(x,[256 256]),{a.size})).name},',');
AD_etc = eval(['{',[b{:}],'}']);
AD_mean = cellfun(@(x)mean(x(:)),AD_etc,'un',0);
out = cell2struct([AD_etc;AD_mean],{'data','mean'});
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