Finding frequencies given AC voltage samples

[sekhar4]

Homework Statement

Hey. I am new here.
Recently i got a C assignment (computing) in which i was given around 20 files..each with thousands of AC voltage test samples sampled at 1 ms..so technically 100 samples= 1 second.
I was told that there 3 different kinds of frequencies in the files and that i have to find them.

Homework Equations

freq=1/timeperiod

The Attempt at a Solution

I went through the samples and realized that if I count the no: of 0's ( 0.00045 or 0.0002) etc and divide the total no: by three, I should be getting the no: waves ..
now freq=(total nof waves x 100 ) / total no: of samples .

i just want to know if I am doing it right ..please tell me..
I can write codes no problem ..but I want to know if I am heading in the right direction.
PS- can't upload even one of the .txt files as they are around 127 kb each and the forum only allows 100 kb ... sad

 

[Zryn]

If you have test samples sampled every 1ms (1x10^-3s) then you have 1000 samples per second.

Can you post an example of the numbers which represent one sample?