On 6/27/11 9:53 AM, Charles R Harris wrote:
Some discussion of disk storage might also help. I don't see how the
rules can be enforced if two files are used, one for the mask and
another for the data, but that may just be something we need to live with.
It seems it wouldn't be too big deal to
Hi,
I have three points 10800, 81100, 582000.
What is the easiest way of fitting a log normal and truncated log normal
distribution to these three points using numpy.
I would appreciate your reply for the same.
Cheers
Sachin
On Jun 30, 2011, at 10:03 AM, Sachin Kumar Sharma wrote:
Hi,
I have three points 10800, 81100, 582000.
What is the easiest way of fitting a log normal and truncated log normal
distribution to these three points using numpy.
The lognormal and maximum likelihood fit is available in
On Thu, Jun 30, 2011 at 5:25 AM, Christoph Deil
deil.christ...@googlemail.com wrote:
On Jun 30, 2011, at 10:03 AM, Sachin Kumar Sharma wrote:
Hi,
I have three points 10800, 81100, 582000.
What is the easiest way of fitting a log normal and truncated log normal
distribution to these three
Hi,
On Tue, Jun 28, 2011 at 4:06 PM, Nathaniel Smith n...@pobox.com wrote:
Anyway, it's pretty clear that in this particular case, there are two
distinct features that different people want: the missing data
feature, and the masked array feature. The more I think about it, the
less I see how
On Jun 30, 2011, at 3:31 PM, Matthew Brett wrote:
###
A alternative-NEP on masking and missing values
###
I like the idea of two different special values, np.NA for missing values,
np.IGNORE for masked
On Thu, Jun 30, 2011 at 7:31 AM, Matthew Brett matthew.br...@gmail.comwrote:
Hi,
On Tue, Jun 28, 2011 at 4:06 PM, Nathaniel Smith n...@pobox.com wrote:
Anyway, it's pretty clear that in this particular case, there are two
distinct features that different people want: the missing data
On 06/30/2011 04:17 PM, Charles R Harris wrote:
On Thu, Jun 30, 2011 at 7:31 AM, Matthew Brett matthew.br...@gmail.com
mailto:matthew.br...@gmail.com wrote:
Hi,
On Tue, Jun 28, 2011 at 4:06 PM, Nathaniel Smith n...@pobox.com
mailto:n...@pobox.com wrote:
Anyway, it's
On Thu, Jun 30, 2011 at 8:17 AM, Charles R Harris charlesr.har...@gmail.com
wrote:
On Thu, Jun 30, 2011 at 7:31 AM, Matthew Brett matthew.br...@gmail.comwrote:
Hi,
On Tue, Jun 28, 2011 at 4:06 PM, Nathaniel Smith n...@pobox.com wrote:
Anyway, it's pretty clear that in this particular
On Wed, Jun 29, 2011 at 1:51 PM, Lluís xscr...@gmx.net wrote:
Mark Wiebe writes:
[...]
I think that deciding on the value of NA signal values boils down to
this question: should 3rd party code be able to interpret missing
data
information stored in the separate mask array?
On Wed, Jun 29, 2011 at 1:07 PM, Dag Sverre Seljebotn
d.s.seljeb...@astro.uio.no wrote:
On 06/29/2011 07:38 PM, Mark Wiebe wrote:
On Wed, Jun 29, 2011 at 9:35 AM, Dag Sverre Seljebotn
d.s.seljeb...@astro.uio.no mailto:d.s.seljeb...@astro.uio.no wrote:
On 06/29/2011 03:45 PM, Matthew
On Wed, Jun 29, 2011 at 2:32 PM, Matthew Brett matthew.br...@gmail.comwrote:
Hi,
On Wed, Jun 29, 2011 at 6:22 PM, Mark Wiebe mwwi...@gmail.com wrote:
On Wed, Jun 29, 2011 at 8:20 AM, Lluís xscr...@gmx.net wrote:
Matthew Brett writes:
Maybe instead of np.NA, we could say np.IGNORE,
On Wed, Jun 29, 2011 at 1:20 PM, Lluís xscr...@gmx.net wrote:
Mark Wiebe writes:
There seems to be a general idea that masks and NA bit patterns imply
particular differing semantics, something which I think is simply
false.
Well, my example contained a difference (the need for the
On Wed, Jun 29, 2011 at 4:21 PM, Eric Firing efir...@hawaii.edu wrote:
On 06/29/2011 09:32 AM, Matthew Brett wrote:
Hi,
[...]
Clearly there are some overlaps between what masked arrays are trying
to achieve and what Rs NA mechanisms are trying to achieve. Are they
really similar
On Wed, Jun 29, 2011 at 5:42 PM, Nathaniel Smith n...@pobox.com wrote:
On Wed, Jun 29, 2011 at 2:40 PM, Lluís xscr...@gmx.net wrote:
I'm for the option of having a single API when you want to have NA
elements, regardless of whether it's using masks or bit patterns.
I understand the desire
On Thu, Jun 30, 2011 at 1:49 AM, Chris Barker chris.bar...@noaa.gov wrote:
On 6/27/11 9:53 AM, Charles R Harris wrote:
Some discussion of disk storage might also help. I don't see how the
rules can be enforced if two files are used, one for the mask and
another for the data, but that may
Hi,
On Thu, Jun 30, 2011 at 2:58 PM, Pierre GM pgmdevl...@gmail.com wrote:
On Jun 30, 2011, at 3:31 PM, Matthew Brett wrote:
###
A alternative-NEP on masking and missing values
###
I like the idea of
On Jun 30, 2011, at 5:38 PM, Matthew Brett wrote:
Hi,
On Thu, Jun 30, 2011 at 2:58 PM, Pierre GM pgmdevl...@gmail.com wrote:
On Jun 30, 2011, at 3:31 PM, Matthew Brett wrote:
###
A alternative-NEP on masking and missing values
Clearly there are some overlaps between what masked arrays are
trying to achieve and what Rs NA mechanisms are trying to achieve.
Are they really similar enough that they should function using
the same API?
Yes.
And if so, won't that be confusing?
No, I don't
Mark Wiebe writes:
On Wed, Jun 29, 2011 at 1:20 PM, Lluís xscr...@gmx.net wrote:
[...]
As far as I can tell, the only required difference between them is
that NA bit patterns must destroy the data. Nothing else. Everything
on top of that is a choice of API and interface mechanisms. I
On Thu, Jun 30, 2011 at 11:04 AM, Gary Strangman str...@nmr.mgh.harvard.edu
wrote:
Clearly there are some overlaps between what masked arrays are
trying to achieve and what Rs NA mechanisms are trying to achieve.
Are they really similar enough that they should function using
Hi,
On Thu, Jun 30, 2011 at 5:03 PM, Pierre GM pgmdevl...@gmail.com wrote:
On Jun 30, 2011, at 5:38 PM, Matthew Brett wrote:
Hi,
On Thu, Jun 30, 2011 at 2:58 PM, Pierre GM pgmdevl...@gmail.com wrote:
On Jun 30, 2011, at 3:31 PM, Matthew Brett wrote:
Hi,
On Thu, Jun 30, 2011 at 5:13 PM, Mark Wiebe mwwi...@gmail.com wrote:
On Thu, Jun 30, 2011 at 11:04 AM, Gary Strangman
str...@nmr.mgh.harvard.edu wrote:
Clearly there are some overlaps between what masked arrays are
trying to achieve and what Rs NA mechanisms are trying to
Mark Wiebe writes:
Why is one magic and the other real? All of this is already
sitting on 100 layers of abstraction above electrons and atoms. If
we're talking about real, maybe we should be programming in machine
code or using breadboards with individual transistors.
M-x butterfly RET
I'm trying to convert some IDL code to python/numpy and i'm having some
trouble understanding the rules for boradcasting during some operations.
example:
given the following arrays:
a = array((2048,3577), dtype=float)
b = array((256,25088), dtype=float)
c = array((2048,3136), dtype=float)
d =
2011/6/30 Thomas K Gamble tkgam...@windstream.net
I'm trying to convert some IDL code to python/numpy and i'm having some
trouble understanding the rules for boradcasting during some operations.
example:
given the following arrays:
a = array((2048,3577), dtype=float)
b = array((256,25088),
Ok, I think it's time to step back and reformulate the problem by
completely ignoring the implementation.
Here we have 2 generic concepts (i.e., applicable to R), plus another
extra concept that is exclusive to numpy:
* Assigning np.NA to an array, cannot be undone unless through explicit
On Thu, Jun 30, 2011 at 6:31 AM, Matthew Brett matthew.br...@gmail.com wrote:
In the interest of making the discussion as concrete as possible, here
is my draft of an alternative proposal for NAs and masking, based on
Nathaniel's comments. Writing it, it seemed to me that Nathaniel is
right,
Hi,
On Thu, Jun 30, 2011 at 6:46 PM, Lluís xscr...@gmx.net wrote:
Ok, I think it's time to step back and reformulate the problem by
completely ignoring the implementation.
Here we have 2 generic concepts (i.e., applicable to R), plus another
extra concept that is exclusive to numpy:
*
Hi,
On Thu, Jun 30, 2011 at 6:51 PM, Nathaniel Smith n...@pobox.com wrote:
On Thu, Jun 30, 2011 at 6:31 AM, Matthew Brett matthew.br...@gmail.com
wrote:
In the interest of making the discussion as concrete as possible, here
is my draft of an alternative proposal for NAs and masking, based on
On 30.06.2011, at 7:32PM, Thomas K Gamble wrote:
I'm trying to convert some IDL code to python/numpy and i'm having some
trouble understanding the rules for boradcasting during some operations.
example:
given the following arrays:
a = array((2048,3577), dtype=float)
b =
On Thu, Jun 30, 2011 at 11:46 AM, Lluís xscr...@gmx.net wrote:
Ok, I think it's time to step back and reformulate the problem by
completely ignoring the implementation.
Here we have 2 generic concepts (i.e., applicable to R), plus another
extra concept that is exclusive to numpy:
*
On Thu, Jun 30, 2011 at 11:51 AM, Matthew Brett matthew.br...@gmail.comwrote:
Hi,
On Thu, Jun 30, 2011 at 6:46 PM, Lluís xscr...@gmx.net wrote:
Ok, I think it's time to step back and reformulate the problem by
completely ignoring the implementation.
Here we have 2 generic concepts
https://github.com/numpy/numpy/pull/101
Thanks,
Mark
___
NumPy-Discussion mailing list
NumPy-Discussion@scipy.org
http://mail.scipy.org/mailman/listinfo/numpy-discussion
Matthew Brett writes:
[...]
I'm afraid, like you, I'm a little lost in the world of masking,
because I only need the NAs. I was trying to see if I could come up
with an API that picked up some of the syntactic convenience of NAs,
without conflating NAs with IGNOREs. I guess we need some
On Thu, Jun 30, 2011 at 11:42 AM, Matthew Brett matthew.br...@gmail.comwrote:
Hi,
On Thu, Jun 30, 2011 at 5:13 PM, Mark Wiebe mwwi...@gmail.com wrote:
On Thu, Jun 30, 2011 at 11:04 AM, Gary Strangman
str...@nmr.mgh.harvard.edu wrote:
Clearly there are some overlaps between what
On Thu, Jun 30, 2011 at 11:54 AM, Lluís xscr...@gmx.net wrote:
Mark Wiebe writes:
Why is one magic and the other real? All of this is already
sitting on 100 layers of abstraction above electrons and atoms. If
we're talking about real, maybe we should be programming in machine
code or
On Thu, Jun 30, 2011 at 11:27 AM, Lluís xscr...@gmx.net wrote:
As I tried to convey on my other mail, separating both will force you to
either:
* Make a copy of the array before passing it to another routine (because
the routine will assign np.NA but you still want the original data)
To
On Wed, Jun 29, 2011 at 2:21 PM, Eric Firing efir...@hawaii.edu wrote:
In addition, for new code, the full-blown masked array module may not be
needed. A convenience it adds, however, is the automatic masking of
invalid values:
In [1]: np.ma.log(-1)
Out[1]: masked
I'm sure this horrifies
Hi,
On Thu, Jun 30, 2011 at 7:27 PM, Lluís xscr...@gmx.net wrote:
Matthew Brett writes:
[...]
I'm afraid, like you, I'm a little lost in the world of masking,
because I only need the NAs. I was trying to see if I could come up
with an API that picked up some of the syntactic convenience of
Nathaniel Smith writes:
On Thu, Jun 30, 2011 at 11:27 AM, Lluís xscr...@gmx.net wrote:
As I tried to convey on my other mail, separating both will force you to
either:
* Make a copy of the array before passing it to another routine (because
the routine will assign np.NA but you still want
On 06/30/2011 08:53 AM, Nathaniel Smith wrote:
On Wed, Jun 29, 2011 at 2:21 PM, Eric Firingefir...@hawaii.edu wrote:
In addition, for new code, the full-blown masked array module may not be
needed. A convenience it adds, however, is the automatic masking of
invalid values:
In [1]:
On Thu, Jun 30, 2011 at 12:27 PM, Eric Firing efir...@hawaii.edu wrote:
On 06/30/2011 08:53 AM, Nathaniel Smith wrote:
On Wed, Jun 29, 2011 at 2:21 PM, Eric Firingefir...@hawaii.edu wrote:
In addition, for new code, the full-blown masked array module may not be
needed. A convenience it adds,
Matthew Brett writes:
Hi,
On Thu, Jun 30, 2011 at 7:27 PM, Lluís xscr...@gmx.net wrote:
Matthew Brett writes:
[...]
I'm afraid, like you, I'm a little lost in the world of masking,
because I only need the NAs. I was trying to see if I could come up
with an API that picked up some of the
On 30.06.2011, at 7:32PM, Thomas K Gamble wrote:
I'm trying to convert some IDL code to python/numpy and i'm having some
trouble understanding the rules for boradcasting during some operations.
example:
given the following arrays:
a = array((2048,3577), dtype=float)
b =
On 30.06.2011, at 11:57PM, Thomas K Gamble wrote:
np.add(b.reshape(2048,3136) * c, d, out=a[:,:3136])
But to say whether this is really the equivalent result to what IDL does,
one would have to study the IDL manual in detail or directly compare the
output (e.g. check what happens to the
Hi,
On Thu, Jun 30, 2011 at 9:01 PM, Lluís xscr...@gmx.net wrote:
Matthew Brett writes:
Hi,
On Thu, Jun 30, 2011 at 7:27 PM, Lluís xscr...@gmx.net wrote:
Matthew Brett writes:
[...]
I'm afraid, like you, I'm a little lost in the world of masking,
because I only need the NAs. I was trying
It seems to me, that what ``func`` should do, if it wants you to be
able to unmask the NAs, is to make a masked array view of ``arr``, and
return that. And indeed the simplicity of the separated API
immediately makes that clear - in my view at least.
I agree on this example. My only concern
On Thu, Jun 30, 2011 at 6:02 PM, Matthew Brett matthew.br...@gmail.comwrote:
Hi,
On Thu, Jun 30, 2011 at 9:01 PM, Lluís xscr...@gmx.net wrote:
Matthew Brett writes:
Hi,
On Thu, Jun 30, 2011 at 7:27 PM, Lluís xscr...@gmx.net wrote:
Matthew Brett writes:
[...]
I'm afraid, like you,
On Thu, Jun 30, 2011 at 10:51 AM, Nathaniel Smith n...@pobox.com wrote:
On Thu, Jun 30, 2011 at 6:31 AM, Matthew Brett matthew.br...@gmail.com
wrote:
In the interest of making the discussion as concrete as possible, here
is my draft of an alternative proposal for NAs and masking, based on
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