matlabsignal-processing

How to Implement Box Function in better way in Matlab?


  • This function in Matlab presents Box_Function:

    • output = 1 while sample n belongs to the range (-a, +a).
    • otherwise the output is 0 outside that range.
  • So how can I implement this function in Matlab in a better way to shift the plot in case of negative values of time, without assigning negative values to the array.

Thanks in Advance

function B_X = Box_Func(N,K,a)
if(N <= 0)||(K+a > N) 
    warning('Please Enter Valid Positive Integer !');
else 
    B_X = zeros([-N N]); 
    for i = -N : 1 : N 
         if (i >= K-a) && (i <= K+a) 
            B_X(i)=1;
        end
    end
end
end

Solution

  • function B_X = Box_Func(N,K,a)
    %   Box_Func This Function takes Number of Samples N,Count of shift K, and 
    %   half of Box width a then it stem Them ,
    %   Note it works only for positive shifting
    %   that means K should be positive or Zero
    
    if(N <= 0)||(K+a > N) % if samples Number wrong, or shifting exceeds limit
        % of Samples Print a warning.
        warning('Please Enter Valid Positive Integer !');
    else % if The inputs are fine , then :
        B_X = zeros([1 2*N+1]);
        x = -N:N;
        B_X(x>=(K-a) & x<=(K+a)) = 1;
        end
    %===========================================    
    % Plotting the Results
    %=========================================== 
        figure('Name','Box Function','NumberTitle','off');
        stem(x,B_X)
        hold on
        xlabel('Samples')
        ylabel('Box Shifeted Function')
        xlim([-N N]) ;
        ylim([-1 2]);
        grid on
        hold off
    end