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Re: [Discuss-gnuradio] Vector operation in GRC


From: Allen, Cam
Subject: Re: [Discuss-gnuradio] Vector operation in GRC
Date: Mon, 19 Dec 2011 21:58:04 +0000

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
>
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> Discuss-gnuradio mailing list
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