Twice

How to make DFT in matlab without FFT [duplicate]
Is DFT and FFT same?What happens if we apply DFT twice to a signal?What makes FFT efficient compared to DFT?Why is the DFT mirrored? Is DFT and FFT ...
How can I test an implementation of DFT for correctness?
What happens if we apply DFT twice to a signal?What is the result of DFT? What happens if we apply DFT twice to a signal?Applying the DFT twice resu...
Similarity in absolute value of nearby DFT coefficients
How do you calculate DFT coefficients?What are the DFT coefficients?What happens if we apply DFT twice to a signal?What is symmetry property of DFT? ...