%=======================================
% DCT-1 : Discrete cosine transform
%---------------------------------------
% Coefficients are same as defined by 
% 6.14 in the book
%
%=======================================
function y=dct1(x)

M      =length(x);
y      =[x;flipud(x(2:M-1,:))];
y_ft   =fft(y);
y      =real(y_ft(1:M,:)/(M-1));
y(1,:) = y(1,:)/2;
y(M,:) = y(M,:)/2;