MATLAB: Mean of matrix elements

averageelementsgolfmatrix

hey all. i have a 5760×1 matrix. i need to find the average of the first 10 elements, remove the 10 elements and replave with the averaged number, find the average of the next 10 elements, remove those 10 elements and replace with average and so on…. could anyone give me an insight as to how to do this? much appreciated john

Best Answer

B = mean(reshape(x,10,[]))'

Where x is your original column vector and B is the mean of every 10x1 chunk

Related Solutions

MATLAB: Divide a vector size into indivisible numbers

 Avg=mean(reshape(A(1:770),10,[]))

or more general

Avg=mean(reshape(A(1:floor(numel(A)/10)*10),10,[]))

MATLAB: Average every n*n elements in a two dimensional matrix

If you have the Image Processing Toolbox, you can use blockproc

blockproc(magic(100),[10 10],@(bs)sum(bs.data(:)))

And for more info:

doc blockproc

Otherwise just use a double for-loop.

OR if you're curious to learn about vectorizing and speed is a top priority:

G = reshape(sum(reshape(sum(reshape(A,sz(1),blk(2),[]),2),blk(1),[]),1),sz./blk);

And broken into pieces:

A   = magic(100);
blk = [10 10];
sz  = size(A);
B   = reshape(A,sz(1),blk(2),[]); %reshape so every blk column is a page
C   = sum(B,2); %sum blocks across rows
D   = reshape(C,blk(1),[]); %reshape so each column is a block
E   = sum(D,1); %sum columns
F   = reshape(E,sz./blk); %reshape to final size.

Best Answer

Related Solutions

MATLAB: Divide a vector size into indivisible numbers

MATLAB: Average every n*n elements in a two dimensional matrix

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