MATLAB: How to find max in a matrix (1,N,2)&& matrix (1,N,3)

matrix (1,1:10,2)= 1 2 3 4 5 6 7 8 9 10
matrix (1,1:10,3)= 2 5 9 2 5 6 2 5 7 5

Is that a way can find out matrix (1,9,:)? which is largest considering both array. Two number are dependent. So I can't find it separately.

any embedded function to do it?

Or I must write a code to calculate their mean value and take the max one.

Best Answer

Hi Tabw,

You can add those numbers and then use "max" to find their value and their index.

m = matrix (1,1:10,2) + matrix (1,1:10,3) % so  m = [1 2 3 4 5 6 7 8 9 10] + [2 5 9 2 5 6 2 5 7 5]

then find the max in m

[maxValue,maxIndex] = max(m)

Hope this helps.

Be aware of the fact that this is a simple add, you may wanna add their abs or define you're criteria.

Good Luck!

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MATLAB: How to filter a matrix

A = randi(9,6,20) % example matrix of integers
N = 10; % pick how many values to keep
[B,C] = sort(A,2);
B(:,1:end-N) = 0;
R = (1:size(B,1))'*ones(1,size(B,2));
Z = zeros(size(B));
Z(sub2ind(size(B),R,C)) = B % output

Where the example input and output matrix is:

A =
   5   6   7   4   6   5   5   9   3   2   5   7   5   2   1   8   4   9   5   4
   9   3   8   5   7   4   3   2   5   5   8   5   3   6   5   2   9   6   4   7
   5   9   5   9   3   8   3   5   2   3   8   4   2   9   1   5   4   6   5   9
   4   6   8   7   5   7   3   4   5   1   7   6   8   7   8   5   8   6   6   6
   3   2   7   5   6   1   8   4   8   6   2   2   5   8   5   9   9   1   5   2
   7   8   6   6   1   4   3   1   5   3   5   7   7   7   8   7   6   6   7   9
Z =
   0   6   7   0   6   0   0   9   0   0   5   7   5   0   0   8   0   9   5   0
   9   0   8   0   7   0   0   0   0   0   8   5   0   6   5   0   9   6   0   7
   0   9   0   9   0   8   0   5   0   0   8   0   0   9   0   5   0   6   5   9
   0   0   8   7   0   7   0   0   0   0   7   0   8   7   8   0   8   0   6   6
   0   0   7   0   6   0   8   0   8   6   0   0   0   8   5   9   9   0   5   0
   7   8   0   0   0   0   0   0   0   0   0   7   7   7   8   7   0   6   7   9

Note that picking the largest ten values may have unintended side effects: the code above picks the first of identical values, which means although one value might exist in multiple locations in one row, it is possible that only the first ones get returned (e.g 5 in the first row: there are actually six of them in the original matrix, but only three in the output). By "filtering" based on value rather than number of occurrences you could avoid this problem.

MATLAB: How to eliminate the repeated number

number= 1: 10;
t=[1 3 5 7];
out=setdiff(number,t)

Best Answer

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