> Well, when you do the Fourier Series summation, just leave out the components with frequencies greater than f1. ========================== exactly,my problem is here.I want to remove frequencies higher than f1,but I don't know how code it in MATLAB? for example,following code is imperfect.please perfect it. data1 = rand(1,n) % suppose data1 is my data. data2 = dct(data) % data2 is discrete cosine transform of data1.
% now!How draw it's figure in discrete frequency domain and leave out f > f1 ? ghasem