proof if value is greatest of a range of Values

Dear all,

i have got following problem. I am very thankful for any answer! See m+/-50: I want to refer to a range of rows and see if for example cell(230,1) has got the greatest value of all 50 cells above and below it (180:280,1). I tried with: (m-50:m+50,1) but it doesn´t work. Can u help me?

if true
for m=1:e-a
if X(m,3)==1 && X(m,1)>=X(m+/-50,1)
    X(m,5)=1;
else
    disp('zero')
end
end

Answer 1

[KL]

Yes, you could do that but I'm unsure if you'd really need a for-loop. If you could explain your real intentions, the actual solution maybe simpler. I'm gonna assume you know you'd need it only this way.

range = 50; 
sz = size(X);
for k=1:sz(1)
    if X(k)>=X(max(1,k-range):min(k+range,sz(1)))
        X(k)
    else
        disp('nada')
    end
end

Here I've considered to be a vector(you could simply add the second index when you write it for a matrix) and I check if the k-th element is greater or equal to the biggest of the elements within the given range. I have used max and min, so we cover the range where we have less elements on either side.

[Jonas Maurer]

Hey KL, thank you so much for your answer again! Here i attached a pic in which my target is focused. Maybe you have got a better way to reach.

I tried out to use the && condition, but MatLab then points out it needs logicals

Second problem is - how do i manage to write the outputs of values and `nadas´into a column of the same variable?

range = 50;

sz = size(X);

for k=1:sz(1)

      if *X(k,2)<=50 &&* X(k,1)>=X(max(1,k-range):min(k+range,sz(1)))
          X(k)
      else
          disp('nada')
      end
  end

Thanks a lot:)

[Jonas Maurer]

It´s me again. I found it works with the code below. But is there any option to use a word instead of the ouput 1. I tried with disp('bla'), but this on states to many output arguments. Thanks for your help a lot!! I am very glad to make progress!

for m=51:e-a-51

    if X(m,2)<=50 && X(m,1)==max(X(m-50:m+50,1))
        X(m,3)=1;
    else
        X(m,3)=0;
    end
end

[KL]

Very good, yeah, that's the idea. If you want to store words, you cannot use a numeric matrix, obviously. Alternative is to use a cell array or a table. They both help you store different data types together in a matrix like format but latter would be my suggestion.

https://www.mathworks.com/help/matlab/cell-arrays.html

https://www.mathworks.com/help/matlab/ref/table.html