MATLAB: How to create another matrix with the sum of every 30 rows in a 14,400 by 11 matrix

reshapesum

I have a matrix with 11 columns of daily data for 40 years (14,400 days) and need the sum of every 30 days to be calculated. After looking around a lot I decided I'd ask on here. Thanks in advance for the help!

Best Answer

out = squeeze(sum(reshape(yourdata',11,30,[]),2))';

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MATLAB: Reshape a matrix in a special manner

 A = rand(100,130);
 step = 10;
 C = cell2mat(arrayfun(@(i,j) mean(A(:,i:j),2),...
     1:step:length(A)-step, 1+step:step:length(A),'un',0))

MATLAB: How to compute Radon transform

You can downsample the result with the following

function M=downsampn(M,bindims)
%DOWNSAMPN - simple tool for downsampling n-dimensional nonsparse arrays
%




%  M=downsampn(M,bindims)
%
%in:
%
% M: an array
% bindims: a vector of integer binning dimensions
%
%out:
%
% M: the downsized array
nn=length(bindims);
[sz{1:nn}]=size(M); %M is the original array
sz=[sz{:}];
newdims=sz./bindims;
args=num2cell([bindims;newdims]);
M=reshape(M,args{:});
for ii=1:nn
   M=mean(M,2*ii-1);
end
M=reshape(M,newdims);

Best Answer

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MATLAB: Reshape a matrix in a special manner

MATLAB: How to compute Radon transform

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