Trying to find the maximum value in a matrix using for loops? Can someone correct my code?

Here is the question:

Find the largest element of the matrix A = [1,2,3; 4,5,6] using for loops.

Here is what I have:

A=[1,2,3;4,5,6]

maxval=A(2)

for ii=3:length(A)

if A(ii)>maxval

maxval=A(ii);

end

end

I am not getting the right answer at all...in fact, Matlab is outputting 2. Help please?

Answer 1

[Image Analyst]

length() gives the max length of the longest dimension of an array. So you can either use

A=[1,2,3;4,5,6]
maxval = -inf;
for k = 1 : numel(A)
    if A(k) > maxval
        maxval=A(k)
    end
end

or use two indexes and two loops:

A=[1,2,3;4,5,6]
maxval = -inf;
for row = 1 : size(A, 1)
	for column = 1 : size(A, 2)
		if A(row, column) > maxval
			maxval=A(row, column)
		end
	end
end