discuss-gnuradio
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] Vector operation in GRC


From: Nowlan, Sean
Subject: Re: [Discuss-gnuradio] Vector operation in GRC
Date: Mon, 19 Dec 2011 22:05:56 +0000

If you're somewhat familiar with how to write/modify blocks, it probably 
wouldn't be difficult to implement that functionality by making a new block 
that is a copy of gr_multiply_const_vcc.cc (for instance) and changing the work 
function to do what you want.

Sean

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Allen, Cam
Sent: Monday, December 19, 2011 4:58 PM
To: Ed Criscuolo
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] Vector operation in GRC

Hmm... I'm not sure about that.  Seems reasonable to assume that the 
stream-to-vector and vector-to-stream blocks would be inverses of each other.  
Mostly I'd just be worried about the first or last subtraction - you might only 
get a length 1023 vector out at the end.

When you link it up, can you tell whether it produces reasonable results?


-----Original Message-----
From: Ed Criscuolo [mailto:address@hidden
Sent: Monday, December 19, 2011 4:42 PM
To: Allen, Cam
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] Vector operation in GRC

Will that preserve the absolute positions of the original vector elements?  The 
initial vector represents an FFT, so it's important to me that I keep the same 
positions.

@(^.^)@  Ed

On 12/19/11 4:33 PM, Allen, Cam wrote:
> I would probably try converting the vector to a stream, delay the stream by 1 
> sample, subtract one stream from the other, and then convert the resulting 
> (difference) stream back to a vector.
>
> -Cam
>
> -----Original Message-----
> From: address@hidden 
> [mailto:address@hidden On Behalf 
> Of Ed Criscuolo
> Sent: Monday, December 19, 2011 4:21 PM
> To: address@hidden
> Subject: [Discuss-gnuradio] Vector operation in GRC
>
> I have a vector quantity (size 1024), and I want to do a calculation 
> on it such that v_out[i] = v_in[i] - v_in[i-1]
>
> Is such a calculation possible in GRC?  I haven't found any way to get 
> a hold of the individual elements of a vector.
>
> @(^.^)@  Ed
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio


_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio



reply via email to

[Prev in Thread] Current Thread [Next in Thread]