MATLAB: Hi , can anyone help me to do this , thank you

MATLABmatrix manipulation

% i have a matrix 4×32 , and i need to sum the element to obtain a matrix 4×4

clear all

clc

A= randn(4,32) ;

% (1 5 9 13 17 21 25 29) i need to take this colum and sum in row ( sum,2) so i obtain a matrix 4×1

%(2 6 10 14 18 22 26 30) i need to take this colum and sum in row ( sum,2) so i obtain a matrix 4×1

%(3 7 11 15 19 23 27 31) i need to take this colum and sum in row ( sum,2) so i obtain a matrix 4×1

%(4 8 12 16 20 24 28 32) i need to take this colum and sum in row ( sum,2) so i obtain a matrix 4×1

%to obtain at the end a matrix 4×4

% thank you

Best Answer

Z=permute(reshape(A.',8,4,[]),[2,1,3]);
Wanted = reshape(sum(Z,2),4,[])

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MATLAB: How to perform tensor summation without using “for” loop

A = [1 2 3 4; 5 6 7 8; 9 10 11 12];
rows = num2cell(A, 2);  %split A, keeping columns together
[rows{:}] = ndgrid(rows{:});  %calculate cartesian product of all the rows
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Note that the above iterates over the elements of row1, then row2, ... then rown. If you want the reverse, then change the second line to:

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Your example is ambiguous in that respect.

Best Answer

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