How can write a function DFT(x) (in terms of jw) such that for the given discrete signal x[n]: >

creating function matlab code

Walter Roberson 2018-5-18

What is w in this context?

Walter Roberson 2018-5-18

Is x[n] intended to indicate x multiplied by floor(n)? Because if it is intended to indicate indexing then you cannot index at infinity.

编辑：geometry geometry 2018-5-18

no x[n] is a discrete type signal. and DFT is the Fourier transform of x[n]. (w is frequency variable)

Guillaume 2018-5-18

A discrete transform is by definition over a finite discrete domain, not -∞, +∞.

The discrete fourier transform is the fft function in matlab. Is that what you're asking?

I don't want to use fft. the signal x[n] is zero for large n. (for example we can assume that x[n]=0 for n<-100 and n>100).

the result of DFT should be in terms of w.

Guillaume 2018-5-18

I think you need to explain in a lot more details what it is you're after. Perhaps, give some concrete examples.

I don't want to use fft. Why not? This gives you the frequencies (ω) of your discrete signal.

I'm going to plot DFT.

Because my project says to do it without using fft.