find a maximum matrix of three matrices

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mahesh chathuranga 2016-2-11

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编辑： Guillaume 2016-2-11

I have three matrices. A=[8,1,6;3,5,7;4,9,2], B=[6,7,2;7,4,8;1,2,3], C=[4,8,5;3,2,1;1,1,1], . I want to find the maximum of A,B and C matrices. answer should be [8,8,6;7,5,8;4,9,3]. I used max(A,B,C) Command.but it is not working.Can any one help me.

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Stephen23 2016-2-11

在 MATLAB Online 中打开

Don't store your data in lots of matrices: store your data in one ND array and then this task (and many others) becomes quite trivial:

max(array,[],dim)

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Answer 1

Torsten 2016-2-11

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D = max(max(A,B),C)

Best wishes

Torsten.

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Guillaume 2016-2-11

编辑：Guillaume 2016-2-11

在 MATLAB Online 中打开

It's not difficult to implement a function that will take an arbitrary number of matrices:

function max_matrices(varargin)
%MAX_MATRICES compute the maximum of several matrices
%syntax:
%   mx = max_matrices(M1, M2, ...)
%   mx = max_matrices(CellArayOfMatrices{:})
   assert(nargin > 0, 'max_matrices requires at least one matrix');
   mx = varargin{1};
   for mxidx = 2:nargin
      mx = max(mx, varargin{mxidx});
   end
end

Note that you should prefer the second form shown under usage, that is store all your matrices into a cell array.

edit: And actually as per stephen's comment, a much simpler way is to just concatenate the matrix in a higher dimension, and one call to max would do it:

function max_matrices(varargin)
%MAX_MATRICES compute the maximum of several matrices
%syntax:
%   mx = max_matrices(M1, M2, ...)
%   mx = max_matrices(CellArayOfMatrices{:})
   assert(nargin > 0, 'max_matrices requires at least one matrix');
   dims = ndim(varargin{1})
   mx = max(cat(dims + 1, varargin{:}), [], dims+1);
end