gusucode.com > ​数字信号处理，包括：各种现有信号及随机信号的输入，从文件读取数据的输入 > Digital Signal Matlab ex1/IDCT.m

    axes(handles.axes4);
Xaxis=str2num(get(handles.EditX,'String'));
Yaxis=str2num(get(handles.EditY,'String'));
x=[-Xaxis:Xaxis]
global SignalTran;
Xk=SignalTran;
y=idct(Xk);
%subplot(2,2,4);
stem(x,y,'.k');

length=max(y);
axis([-num,num,-length,length]);
title('离散余弦反变换')