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/PNone.m

    axes(handles.axes3);
Xaxis=str2num(get(handles.EditX,'String'));
Yaxis=str2num(get(handles.EditY,'String'));
fs=str2num(get(handles.EditSC_fs,'String'));
global Signal;
y=Signal;
periodogram(y,[],1024,fs);