# NumPy 1.6.2 Release Notes

This is a bugfix release in the 1.6.x series. Due to the delay of the NumPy 1.7.0 release, this release contains far more fixes than a regular NumPy bugfix release. It also includes a number of documentation and build improvements.

## Issues fixed

### `numpy.core`

- #2063: make unique() return consistent index

- #1138: allow creating arrays from empty buffers or empty slices

- #1446: correct note about correspondence vstack and concatenate

- #1149: make argmin() work for datetime

- #1672: fix allclose() to work for scalar inf

- #1747: make np.median() work for 0-D arrays

- #1776: make complex division by zero to yield inf properly

- #1675: add scalar support for the format() function

- #1905: explicitly check for NaNs in allclose()

- #1952: allow floating ddof in std() and var()

- #1948: fix regression for indexing chararrays with empty list

- #2017: fix type hashing

- #2046: deleting array attributes causes segfault

- #2033: a**2.0 has incorrect type

- #2045: make attribute/iterator_element deletions not segfault

- #2021: fix segfault in searchsorted()

- #2073: fix float16 __array_interface__ bug

### `numpy.lib`

- #2048: break reference cycle in NpzFile

- #1573: savetxt() now handles complex arrays

- #1387: allow bincount() to accept empty arrays

- #1899: fixed histogramdd() bug with empty inputs

- #1793: fix failing npyio test under py3k

- #1936: fix extra nesting for subarray dtypes

- #1848: make tril/triu return the same dtype as the original array

- #1918: use Py_TYPE to access ob_type, so it works also on Py3

### `numpy.distutils`

- #1261: change compile flag on AIX from -O5 to -O3

- #1377: update HP compiler flags

- #1383: provide better support for C++ code on HPUX

- #1857: fix build for py3k + pip

- BLD: raise a clearer warning in case of building without cleaning up first

- BLD: follow build_ext coding convention in build_clib

- BLD: fix up detection of Intel CPU on OS X in system_info.py

- BLD: add support for the new X11 directory structure on Ubuntu & co.

- BLD: add ufsparse to the libraries search path.

- BLD: add ‘pgfortran’ as a valid compiler in the Portland Group

- BLD: update version match regexp for IBM AIX Fortran compilers.

### `numpy.random`

- BUG: Use npy_intp instead of long in mtrand

## Changes

### `numpy.f2py`

- ENH: Introduce new options extra_f77_compiler_args and extra_f90_compiler_args

- BLD: Improve reporting of fcompiler value

- BUG: Fix f2py test_kind.py test

### `numpy.poly`

- ENH: Add some tests for polynomial printing

- ENH: Add companion matrix functions

- DOC: Rearrange the polynomial documents

- BUG: Fix up links to classes

- DOC: Add version added to some of the polynomial package modules

- DOC: Document xxxfit functions in the polynomial package modules

- BUG: The polynomial convenience classes let different types interact

- DOC: Document the use of the polynomial convenience classes

- DOC: Improve numpy reference documentation of polynomial classes

- ENH: Improve the computation of polynomials from roots

- STY: Code cleanup in polynomial [*]fromroots functions

- DOC: Remove references to cast and NA, which were added in 1.7