On 12 November 2012 21:21, Jordi Gutiérrez Hermoso <[email protected]> wrote:
> OF list: fftconv2's vector-vector-matrix three-arg call seems
> incorrect and seems to have been incorrect for some time. Can anyone
> please confirm? These two calls should both be equal:
>
> octave:1> conv2(1:3, 1:2, [1 2; 3 4; 5 6])
> ans =
>
> 1 4 4
> 5 18 16
> 14 48 40
> 19 62 48
> 15 48 36
>
> octave:2> fftconv2(1:3, 1:2, [1 2; 3 4; 5 6])
> ans =
>
> 1 4 7 6
> 5 18 31 24
> 11 36 61 42
> 10 32 54 36
>
>
> The upper result is correct. You can nobtain this result with
> fftconv2(fftconv2([1 2; 3 4; 5 6,1:2),1:3), so I think this should be
> fairly easy to fix.
You can't. Your alternative gives a syntax error, I believe you meant
what I tried below which still does not give the same result. See:
octave> conv2(1:3, 1:2, [1 2; 3 4; 5 6])
ans =
1 4 4
5 18 16
14 48 40
19 62 48
15 48 36
octave> fftconv2(fftconv2([1 2; 3 4; 5 6], 1:2), 1:3)
ans =
1 6 15 20 12
3 16 37 46 24
5 26 59 72 36
Carnë
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