Tensors

What is a tensor

What is a Tensor? Tensors are simply mathematical objects that can be used to describe physical properties, just like scalars and vectors. In fact tensors are merely a generalisation of scalars and vectors; a scalar is a zero rank tensor, and a vector is a first rank tensor.

function z=Fast_Fourier_Transform(x,nfft)
N=length(x);
z=zeros(1,nfft);
Sum=0;
for k=1:nfft
    for jj=1:N
        Sum=Sum+x(jj)*exp(-2*pi*j*(jj-1)*(k-1)/nfft);
    end
    z(k)=Sum;
    Sum=0;
end
end