# [SciPy-user] Wrapping geqp3 (Rank revealing QR)

Nils Wagner nwagner at mecha.uni-stuttgart.de
Fri Feb 24 10:12:21 CST 2006

```Pearu Peterson wrote:
>On Fri, 24 Feb 2006, Nils Wagner wrote:
>
>
>>>subroutines are explained.
>>>
>>>
>>>
>>Sure. I mean the special handling inside the wrapper.
>>I found several ways for different routines to declare  _lwork
>>
>><_lwork=3*n-1,\0,2*n-1,\2>
>> integer optional,intent(in),depend(n) :: lwork=<_lwork>
>> check(<_lwork>\<=lwork) lwork
>>
>>    ! <_lwork=(compute_vl||compute_vr)?4*n:3*n,\0,2*n,\2>
>>    integer optional,intent(in),depend(n,compute_vl,compute_vr) ::
>>lwork=<_lwork>
>>    check(lwork>=<_lwork>) :: lwork
>>
>>    !
>><_lwork=3*minmn+MAX(2*minmn\,MAX(maxmn\,nrhs)),\0,2*minmn+MAX(maxmn\,nrhs),\2>
>>    integer optional,intent(in),depend(nrhs,minmn,maxmn), &
>>         check(lwork>=1) &
>>         :: lwork=<_lwork>
>>         !check(lwork>=<_lwork>)
>>
>>! <_lwork=n,\0,\0,\0>
>>    integer optional,intent(in),depend(n),check(lwork\>=<_lwork>) ::
>>lwork=<_lwork>
>>    <ftype> dimension(lwork),intent(hide,cache),depend(lwork) :: work
>>
>>
>>Which way is suitable here ?
>>
>
>blocks. And read ?geqp3.f to find out what are proper _lwork values
>for each version of geqp3 subroutine.
>
>Pearu
>
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>
>>> numpy.distutils.from_template.__doc__
Traceback (most recent call last):
File "<stdin>", line 1, in ?
AttributeError: 'module' object has no attribute 'from_template'

>>> dir (numpy.distutils)
['ScipyTest', '_INSTALLED', '__builtins__', '__config__', '__doc__',
'__file__', '__name__', '__path__', '__version__', 'ccompiler',
'exec_command', 'log', 'misc_util', 'test', 'unixccompiler']

Am I missing something ?

Nils

```