[GRASS-dev] d.vect -a shows only some elements

Martin Landa landa.martin at gmail.com
Fri Oct 20 15:37:43 EDT 2006

Hi Moritz,

2006/10/20, Moritz Lennert <mlennert at club.worldonline.be>:


> I have done some testing, and the problem seems to be in line 224 of
> display/d.vect/area.c:
> if (db_CatValArray_get_value (&cvarr_rgb, cat, &cv_rgb) != DB_OK)
> db_CatValArray_get_value returns 'not found' for many of the cat values.
> I am wondering whether this might be due to the fact that the bsearch in
> db_CatValArray_get_value needs a sorted array, but that the array is not
> sorted as db_select_CatValArray() which creates the array on line 67 of
> the same file only sorts lists of ints or doubles, but not of strings...

you are right (if I understand well), adding

db_CatValArray_sort (&cvarr_rgb);

should solve the problem. I wonder why db_select_CatValArray sorts
cvarr->value by category number only for data type int or double...
(?), see

00300     if ( type == DB_C_TYPE_INT )
00301         qsort( (void *) cvarr->value, nrows, sizeof(dbCatVal), cmpcat);
00302     else if ( type == DB_C_TYPE_DOUBLE )
00303         qsort( (void *) cvarr->value, nrows, sizeof(dbCatVal), cmpcat);

Best regards, Martin

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Martin Landa <landa.martin at gmail.com> * http://gama.fsv.cvut.cz/~landa *

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