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matlabmatrixmaxcell-array

Merge two matrix and find the maximum of its attributes

I've two matrix a and b and I'd like to combine the rows in a way that in the first row I got no duplicate value and in the second value, columns in a and b which have the same row value get the maximum value in new matrix. i.e.

a = 1     2     3
    8     2     5 

b = 1     2     5     7
    2     4     6     1

Desired output

c =  1     2     3     5     7
     8     4     5     6     1

Any help is welcomed,please.( the case for accumulation is asked here)

Solution

  • Accumarray accepts functions both anonymous as well as built-in functions. It uses sum function as default. But you could change this to any in-built or anonymous functions like this:

    In this case you could use max function.

    in = horzcat(a,b).';
[uVal,~,idx] = unique(in(:,1));

out = [uVal,accumarray(idx,in(:,2),[],@max)].'