Hi all

I have previous experience with Matlab, but the problem that I face some problems in apply a problem in (DSP : Digital signal processing) which is not my study field, but I must finish that problems in days to complete my project. all i want is help me with method and steps of solving this problem in matlab and then I can write the code with myself.

the problem is about the signal

x(t) = exp(-a*t);

1) what's the Discrete Fourier transform of the sampled signal with sample rate fs

2) if a=1 and fs =1 , plot the amplitude spectrum of sampled signal

3) fix the sampling frequency at fs = 1(hz) [what's it mean ?] and plot the magnitude of the Fourier Transform of the sampled signal at various values of a

thanks