《DSP using MATLAB》Problem 5.2

        代码：

%% ----------------------------------------------------------------------------------
%%            Output Info about this m-file
fprintf('\n*******************************************************************\n');
fprintf('        <DSP using MATLAB> Problem 5.2 \n\n');

banner();
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% ------------------------------------
%              X1(k)
% ------------------------------------
Xk = [4, 3*j, -3*j]; N = 3; 
xn_1 = idfs(Xk, N)

% ------------------------------------
%              X2(k)
% ------------------------------------
Xk = [j, 2*j, 3*j, 4*j]; N = 4; 
xn_2 = idfs(Xk, N)


% ------------------------------------
%              X3(k)
% ------------------------------------
Xk = [1, 2+3*j, 4, 2-3*j]; N = 4; 
xn_3 = idfs(Xk, N)


% ------------------------------------
%              X4(k)
% ------------------------------------
Xk = [0, 0, 2, 0, 0]; N = 5; 
xn_4 = idfs(Xk, N)


% ------------------------------------
%              X5(k)
% ------------------------------------
Xk = [3, 0, 0, 0, -3, 0, 0, 0]; N = 8; 
xn_5 = idfs(Xk, N)

　　运行结果：