On Mon, 02 Feb 2009 14:07:35 -0600 Ryan May <rma...@gmail.com> wrote: > Nils Wagner wrote: >>>> Is this a 64-bit problem ? >>>> >>> I don't know if it's a 64-bit problem per-se, so much as >>> a disagreement between >>> fortran and numpy. Numpy is making the size of the >>> integer fields 8 bytes, while >>> in Fortran, they're only 4 bytes. When constructing >>> your dtype, use np.int32 or >>> '<i4' for your type for the integer fields, and see if >>> that fixes it. >>> >> >> dt = >> np.dtype([('isize','int32'),('irow','int32'),('icol','int32'),('value','float')]) >> >> >>>>> a >> array([(16, 0, 11, 1.2549267404367662e-321), >> (1081065472, 16, 0, 7.9050503334599447e-323), >> (12, 253, 0, 3.4485523805914514e-313), >> (0, 16, 0, 5.3474293932967148e-312), >> (0, 1079312384, 16, 3.3951932655444357e-313), >>(0, >> 14, 251, 62.0), >> (16, 0, 16, 3.1829936864479085e-313), >> (250, 0, 1078525952, 7.9050503334599447e-323), >> (16, 0, 16, 1.2302234581447039e-321), >> (1078231040, 16, 0, 7.9050503334599447e-323), >> (17, 248, 0, 3.4484552433329538e-313), >> (0, 16, 0, 5.2413296037731544e-312), >> (0, 1077805056, 16, 3.3951932655444357e-313), >>(0, >> 19, 246, 27.0), >> (16, 0, 16, 4.2439915819305446e-313), >> (245, 0, 1077411840, 7.9050503334599447e-323)], >> dtype=[('isize', '<i4'), ('irow', '<i4'), >>('icol', >> '<i4'), ('value', '<f8')]) >> > > Maybe on 64-bit machines, the number of bytes is 64-bits >instead of 32 (see the > fact that the first 12 bytes of the file are 16 0 11. > Try: > > dt = > np.dtype([('isize','int64'),('irow','int32'),('icol','int32'),('value','float')]) > > Ryan >
Strange >>> a array([(16, 11, 254, 254.0), (16, 16, 0, 5.3686493512014268e-312), (4638566878703255552, 16, 0, 7.9050503334599447e-323), (1082331758605, 0, 1079312384, 7.9050503334599447e-323), (16, 14, 251, 62.0), (16, 16, 0, 5.3049894774872906e-312), (4632233691727265792, 16, 0, 7.9050503334599447e-323), (1069446856720, 0, 1078231040, 7.9050503334599447e-323), (16, 17, 248, 35.0), (16, 16, 0, 5.2413296037731544e-312), (4629137466983448576, 16, 0, 7.9050503334599447e-323), (1056561954835, 0, 1077608448, 7.9050503334599447e-323), (16, 20, 245, 24.0)], dtype=[('isize', '<i8'), ('irow', '<i4'), ('icol', '<i4'), ('value', '<f8')]) _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion