Re: Unidentified subject!

[flatmax]

Are your a's, b's and c's hex numbers ?

Expanding on the below routine for hexnumbers :

%# Open the file and read in all of the hexadecimal numbers

%# 'TEST_FILE below will hold frames of DFT'd data
for i=1:length(test_file)/2048-1
 TEST_FILE(i,:)=fft(test_file(i*2048:(i+1)*2048));
end

Matt

On Sun, 26 Nov 2000, Ben Sapp wrote:

> I am not sure I understand exactly what you are trying to do.  Do you mean
> that you want to treat each byte as a new point in time?  Then really each
> byte is not a character but a value from 0-255.  Then you want to take
> 2048 of these points and take the fft of this sample?  I made a dummy
> file called test_file that had a-z all in lower case.  I was able to read
> these characters in and take the fft like so:
> 
> ## open the data file
> test_file = fopen("test_file","r+");
> ## 26 should be changed to 2048 in your case
> [val, count ] = fscanf(test_file,"%s",26);
> ## get the ascii values of the characters 
> data = toascii(val);
> ## take the fft
> fft(data);
> 
> I hope this is in the ballpark of what you are looking for.  
> 
> --
> Ben Sapp                         Los Alamos National Laboratory
> email: <mailto:address@hidden>   Phone: (505)667-3277
> Fax:   (505)665-7920             URL:   http://www.neutrino.lanl.gov/
> --
> 
> On Sun, 26 Nov 2000, Abhra Haldar wrote:
> 
> > 
> > I have a file made up of thousands of characters a's, b's, c's d's. I need 
> > to know how to open this file, divide it into chunks of 2048 characters,
> > and take the Fast Fourier Transform of each of these segments. Can
> > anyone help? 
> >
> >Thanks
> > 
> 
> 
> 
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