How to find find a number from a range of 2d array which is itself a range?

Hi I have an array which is

Alt_greater_than_20000=[20960 27030 22800 29000]

I want to know if an element is found in a specific range of arrays. If yes, I pick up the middle value else i simply take the element as it is.

I generated my range of array as follows:

if true
  num_fl=20;
array_fl=[];

initial_range=19950:50:20050;

% generate a range of flight level for i=1:num_fl

    array_fl(i,:)=initial_range;

    initial_range=initial_range+1000;

end

end

Its corresponding output is

array_fl =

       19950       20000       20050
       20950       21000       21050
       21950       22000       22050
       22950       23000       23050
       23950       24000       24050
       24950       25000       25050
       25950       26000       26050
       26950       27000       27050
       27950       28000       28050
       28950       29000       29050
       29950       30000       30050
       30950       31000       31050
       31950       32000       32050
       32950       33000       33050
       33950       34000       34050
       34950       35000       35050
       35950       36000       36050
       36950       37000       37050
       37950       38000       38050
       38950       39000       39050

So for example,

for 20960 i want its value to be 21000 for 27030 i want its value to be 27000 however for 22800, i want it to be 22800 itself (as it is not found in the range)

if true
  FL=[];

%example Alt_greater_than_20000=[20960 27030 22800 29000] length_array=length(Alt_greater_than_20000);

% for i=1:length_array

for j=1:num_fl

    for i=1:length_array

    if Alt_greater_than_20000(i) >= array_fl(j,1) & Alt_greater_than_20000(i) <= array_fl(j,3)

        FL(i)= array_fl(j,2);

    else
        FL(i)= Alt_greater_than_20000(i);

    end

    end
end    

end

find attached my code. Can you please tell me where i went wrong. Am i using it correctly?

Yashvin

[Stephen23]

Please stop posting duplicate questions:

http://www.mathworks.com/matlabcentral/answers/224752-finding-if-a-particular-value-is-found-in-a-range-of-arrays