On Wed, Mar 21, 2012 at 2:43 PM, Rafael Laboissiere
<raf...@laboissiere.net> wrote:
> * Rafael Laboissiere <raf...@laboissiere.net> [2012-03-18 20:16]:
>
>> 3) The test of shapetransform fails:
>>
>> ==============================================================
>> ***** test
>> v = shapecentroid (shape)(:);
>> nshape = shapetransform (shape, -v);
>> vn = shapecentroid (nshape)(:);
>> assert(vn,[0; 0],1e-2);
>> !!!!! test failed
>> assert (vn,[0; 0],1e-2) expected
>> 0
>> 0
>> but got
>> -682.75
>> -528.18
>> maximum absolute error 682.753 exceeds tolerance 0.01
>> ==============================================================
>
> I tracked down the problem and discovered that it comes from the
> shapecentroid function, which seems to compute the wrong centroid in some
> cases. Here is an example, with the following shape taken from the test
> section of file shapetransform.m:
>
> ############################################################
> shape = {[-93.172 606.368 -476.054 291.429;
> -431.196 637.253 11.085 163.791];
> [-75.3626 -253.2337 457.1678 328.5714;
> 438.7659 -653.6278 -7.9953 380.9336];
> [-89.5841 344.9716 -275.3876 457.1429;
> -170.3613 237.8858 1.0469 158.0765];...
> [32.900 -298.704 145.804 437.143;
> -243.903 369.597 -34.265 226.648];
> [-99.081 409.127 -352.903 317.143;
> 55.289 -114.223 -26.781 318.076];
> [-342.231 191.266 168.108 274.286;
> 58.870 -38.083 -89.358 232.362]};
> ############################################################
>
> Using "shapeplot(shape)", I can clearly see that the centroid for this
> shape is situated around x = 340 and y = 260. However, shapecentroid
> gives the following:
>
> ############################################################
> octave> shapecentroid(shape)
> ans =
>
> -341.38 -264.10
> ############################################################
>
> The values are negated.
>
> Any clues?
>
> Rafael
>
> _______________________________________________
> Pkg-octave-devel mailing list
> pkg-octave-de...@lists.alioth.debian.org
> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-octave-devel
Hi Rafael,
Thanks, yes this is a known bug. It should be marked in the NEWS
function of the package.
I am working on it.
Cheers,
--
M. Sc. Juan Pablo Carbajal
-----
PhD Student
University of Zürich
http://ailab.ifi.uzh.ch/carbajal/
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