COMPGROUPS.NET | Search | Post Question | Groups | Stream | About | Register

FFT Not Defined for Double

• Follow

```I'm running into a strange issue while trying to perform an FFT on a 4PAM modulated signal sampled at 100KHz with a symbol duration of 100 samples.

u_t_4PAM = <1x100000 double>

Relevant code:
fft_4PAM = ftt(u_t_4PAM,length(u_t_4PAM))/length(u_t_4PAM)

??? Undefined function or method 'ftt' for input arguments of type 'double'.
```
 0
Reply Eric 11/5/2010 6:23:07 PM

```Eric wrote:
....

> Relevant code:
> fft_4PAM = ftt(u_t_4PAM,length(u_t_4PAM))/length(u_t_4PAM)
>
> ??? Undefined function or method 'ftt' for input arguments of type
> 'double'.

What do

which fft
whos fft

return?

--
```
 0
Reply dpb 11/5/2010 6:31:51 PM

```"Eric " <eric.williams.neu+matlabcentral@gmail.notthis.com> wrote in message <ib1i2b\$kub\$1@fred.mathworks.com>...
> I'm running into a strange issue while trying to perform an FFT on a 4PAM modulated signal sampled at 100KHz with a symbol duration of 100 samples.
>
> u_t_4PAM = <1x100000 double>
>
> Relevant code:
> fft_4PAM = ftt(u_t_4PAM,length(u_t_4PAM))/length(u_t_4PAM)
>
> ??? Undefined function or method 'ftt' for input arguments of type 'double'.

There is only one among eight is good
TFF, FTT, FTF, FFT, TFT, TTF, FFF, TTT

Bruno
```
 0
Reply Bruno 11/5/2010 6:34:04 PM

```"Bruno Luong" <b.luong@fogale.findmycountry> wrote in message <ib1ims\$3r0\$1@fred.mathworks.com>...
> "Eric " <eric.williams.neu+matlabcentral@gmail.notthis.com> wrote in message <ib1i2b\$kub\$1@fred.mathworks.com>...
> > I'm running into a strange issue while trying to perform an FFT on a 4PAM modulated signal sampled at 100KHz with a symbol duration of 100 samples.
> >
> > u_t_4PAM = <1x100000 double>
> >
> > Relevant code:
> > fft_4PAM = ftt(u_t_4PAM,length(u_t_4PAM))/length(u_t_4PAM)
> >
> > ??? Undefined function or method 'ftt' for input arguments of type 'double'.
>
> There is only one among eight is good
> TFF, FTT, FTF, FFT, TFT, TTF, FFF, TTT
>
> Bruno

Thank you so much Bruno. I need to leave my lab immediately. It's obviously just time to give up for the day :-).
```
 0
Reply Eric 11/5/2010 6:43:06 PM

```Eric wrote:
....

>> > fft_4PAM = ftt(u_t_4PAM,length(u_t_4PAM))/length(u_t_4PAM)
>> > > ??? Undefined function or method 'ftt' for input arguments of type
>> 'double'.
>>
>> There is only one among eight is good
>> TFF, FTT, FTF, FFT, TFT, TTF, FFF, TTT
>>
>> Bruno
>
> Thank you so much Bruno. I need to leave my lab immediately. It's
> obviously just time to give up for the day :-).

And I missed it, too, ...  :(

--
```
 0
Reply dpb 11/5/2010 7:09:10 PM

4 Replies
631 Views

(page loaded in 0.032 seconds)

Similiar Articles:

7/22/2012 3:28:53 AM