Find the maximum value and its location from a matrix using two nested loops

Hi,

Right now I have this matrix K

K =

      -3    -8     6    -3    -8     6     9    24   -18
      -5    10    -9    -5    10    -9    15   -30    27
       8     4     9     8     4     9   -24   -12   -27
      -9   -24    18    12    32   -24     3     8    -6
     -15    30   -27    20   -40    36     5   -10     9
      24    12    27   -32   -16   -36    -8    -4    -9
       9    24   -18   -15   -40    30     0     0     0
      15   -30    27   -25    50   -45     0     0     0
     -24   -12   -27    40    20    45     0     0     0

I wonder how I can use two nested loops to find the maximum number and its location from this matrix.

It would be great if anyone can help me with this

Thank you very much :)

[sixwwwwww]

Is it homework?

Answer 1

[sixwwwwww]

you can do it as follow:

 MaxValue = -Inf;
 row = 0;
 column = 0;
 for i = 1:size(K, 1)
     for j = 1:size(K, 2)
         if K(i, j) > MaxValue
             MaxValue = K(i, j);
             row = i;
             column = j;
         end
     end
 end

[Jan]

Please do not solve homework questions. Now Kantosa cannot submit this solution without cheating anymore and the effect for his learning experience is not helpful anymore.

[sixwwwwww]

Oh sorry but there was no homework tag with it. How can I know is it homework or user just asking question for learning? I thought that he is not sure that finding maximum is possible with two nested loops or not so I just showed that it is possible

[Image Analyst]

This is the third time this person has asked this question. I suspected it was homework that's why I gave hints like in http://www.mathworks.com/matlabcentral/answers/109031#answer_117670, rather than an outright solution. The person accepted it so I don't know why it was asked again , and asked again without the homework tag even when I explicitly mentioned it. Kantosa, any response to that?

[Kantosa]

Yes it is a homework. I am looking for a way to solve it but not a solution. The reason I posted the question again is to find different ways to solve it (different hints). I am new here and not sure about how this work so I keep posting the question again. Sorry for any misunderstanding. Next time I will put the homework tag down.

[Image Analyst]

But you didn't ask for other ways - you rigidly specified the way. The other, more MATLAB-ish way would be to use the max() function. Look at the two arguments it returns. You might also find ind2sub() helpful,

[Alexandra Vaupotic]

How could you make this a function with an output of the Max value?

Answer 2

[Khalid Mojallid]

MaxValue = -Inf;

row = 0;

column = 0;

for i = 1:size(K, 1)

for j = 1:size(K, 2)

if K(i, j) > MaxValue

MaxValue = K(i, j);

row = i;

column = j;

end

end

end

[Nathan Blais]

I'm guessing K would be the vector we are trying to find the max value for?