Solving DFT of f(n*t) vs t Data Array in C

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souhal.67
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I have a f(n*t) vs t data areay how to find out its (DFT) Fourier transform in c. I find every time that every program needs its real and imaginarry part. but i have only magnitude. please help me out to find DFT of these data .
 
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then how i get the value of omega for ploting
 
after sampling I have value of t & X(t) like
375.020000 -0.754661
375.030000 -0.755227
375.040000 -0.755841
375.050000 -0.756501
375.060000 -0.757207
375.070000 -0.757960
375.080000 -0.758759
375.090000 -0.759604
375.100000 -0.760494
375.110000 -0.761431
375.120000 -0.762414
375.130000 -0.763442
375.140000 -0.764515
375.150000 -0.765633
375.160000 -0.766797
375.170000 -0.768005
375.180000 -0.769258
I would like to find DFT and I need omega/freq and X(W) value
please help me Thank you
 
after sampling I have value of t & X(t) like
375.020000 -0.754661
375.030000 -0.755227
375.040000 -0.755841
375.050000 -0.756501
375.060000 -0.757207
375.070000 -0.757960
375.080000 -0.758759
375.090000 -0.759604
375.100000 -0.760494
375.110000 -0.761431
375.120000 -0.762414
375.130000 -0.763442
375.140000 -0.764515
375.150000 -0.765633
375.160000 -0.766797
375.170000 -0.768005
375.180000 -0.769258
I would like to find DFT and I need omega/freq and X(W) value
please help me Thank you
 
Thank you for reply. I want to find out a frequency Vs Amplitude graph
 
I want to find out time vs Amplitude to frequency vs Amplitude of a signal
 
I have a collage project and I have a system out put I must make a program to find out system's frequency response of numerically.
 
You didn't say what the DFT does. You have asked a question that suggests you have no idea. I could tell you anything and you would believe me. You need to understand about the process.
If you want an answer then put some data in for a familiar waveform for which you know the frequency spectrum. Try some sine waves with different periods.