Median (Median) Filter Matlab

How to write a function of size 3x3 in Matlab without using Matlab's own ready function for the median (median) filter

Answer 1

[KALYAN ACHARJYA]

disp('##Input Data')
a=randi([1,10],[4,5]) %Any random data

%% # Using MATLAB Function medfilt2
disp('##Using MATLAB Median inbuilt function');
result_MATLAB=medfilt2(a)

%% # Own Custom Function 
disp('##Own Median function');
[r c]=size(a);
a_paded=zeros(size(a)+2);
a_paded(2:end-1,2:end-1)=a;
for i=2:r+1
    for j=2:c+1
        data=a_paded(i-1:i+1,j-1:j+1);
        data=sort(data(:));
        result_own(i-1,j-1)=data(round(length(data)/2));
    end 
end 
result_own

%You can avoid loop in later section,please see alternate way

Result:

##Input Data
a =
     5     3     5     4     8
    10     5     3     8     5
     4     1     1     2     5
     8     1     8     1     3
##Using MATLAB Median inbuilt function
result_MATLAB =
     0     3     3     4     0
     3     4     3     5     4
     1     4     2     3     2
     0     1     1     1     0
##Own Median function
result_own =
     0     3     3     4     0
     3     4     3     5     4
     1     4     2     3     2
     0     1     1     1     0