Hi All,
I am a bit new to the NumPy C-API and I am having a hard time with placing
results into output arrays... I am using PyArray_TakeFrom to grab an input
dimension of data, then do a calculation, then I want to pack it back to the
output... yet the PutTo function does not have an axis argum
-boun...@scipy.org] On Behalf Of Bruce Southey
Sent: Wednesday, August 31, 2011 11:11 AM
To: numpy-discussion@scipy.org
Subject: Re: [Numpy-discussion] Question on LinAlg Inverse Algorithm
On 08/31/2011 12:56 PM, Mark Janikas wrote:
> Right indeed... I have spent a lot of time looking at this and
Inverse Algorithm
On Tue, 30 Aug 2011 15:48:18 -0700, Mark Janikas wrote:
> Last week I posted a question involving the identification of linear
> dependent columns of a matrix... but now I am finding an interesting
> result based on the linalg.inv() function... sometime I am able to
&
, Mark Janikas wrote:
> Hello All,
>
> Last week I posted a question involving the identification of linear
> dependent columns of a matrix… but now I am finding an interesting result
> based on the linalg.inv() function… sometime I am able to invert a matrix
> that has linear dep
When I export to ascii I am losing precision and it getting consistency... I
will try a flat dump. More to come. TY
MJ
-Original Message-
From: numpy-discussion-boun...@scipy.org
[mailto:numpy-discussion-boun...@scipy.org] On Behalf Of Mark Janikas
Sent: Tuesday, August 30, 2011 4:02
alues, operator norm, etc..
-Chris JS
On Tue, Aug 30, 2011 at 5:48 PM, Mark Janikas wrote:
> Hello All,
>
>
>
> Last week I posted a question involving the identification of linear
> dependent columns of a matrix. but now I am finding an interesting result
> based on
LinAlgError()... this suggests that
there is some kind of random component to the INV method. Is this normal?
Thanks much ahead of time,
MJ
Mark Janikas
Product Developer
ESRI, Geoprocessing
380 New York St.
Redlands, CA 92373
909-793-2853 (2563)
mjani...@esri.com<mailto:mjani...@esri.
-discussion] Identifying Colinear Columns of a Matrix
On Fri, Aug 26, 2011 at 11:41 AM, Mark Janikas
mailto:mjani...@esri.com>> wrote:
I wonder if my last statement is essentially the only answer... which I wanted
to avoid...
Should I just use combinations of the columns and try and constru
whole k! algorithm.
MJ
-Original Message-
From: numpy-discussion-boun...@scipy.org
[mailto:numpy-discussion-boun...@scipy.org] On Behalf Of Mark Janikas
Sent: Friday, August 26, 2011 10:35 AM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Identifying Colinear Columns of a
riday, August 26, 2011 10:28 AM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Identifying Colinear Columns of a Matrix
On Fri, Aug 26, 2011 at 1:10 PM, Mark Janikas wrote:
> Hello All,
>
>
>
> I am trying to identify columns of a matrix that are perfectly colline
As you will note, since most of the functions work on rows, the matrix in
question has been transposed.
From: numpy-discussion-boun...@scipy.org
[mailto:numpy-discussion-boun...@scipy.org] On Behalf Of Mark Janikas
Sent: Friday, August 26, 2011 10:11 AM
To: 'Discussion of Numerical P
Hello All,
I am trying to identify columns of a matrix that are perfectly collinear. It
is not that difficult to identify when two columns are identical are have zero
variance, but I do not know how to ID when the culprit is of a higher order.
i.e. columns 1 + 2 + 3 = column 4. NUM.corrcoef(m
Hello All,
I was wondering what the best way to trim an array based on some values I do
not want I could use NUM.where or NUM.take... but let me give you an
example:
import numpy as NUM
n = 100 (Length of my dataset)
data = NUM.empty((n,), float)
badRecords = []
for ind, record in enumerat
2:34 PM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Database with Nulls to Numpy Structure
Mark Janikas wrote:
> So, do I use lists and
> append then create the arrays... Or do I fill up the pre-allocated "empty"
> arrays and slice off the ends? Thoughts?
the arrays... Or do I fill up the
pre-allocated "empty" arrays and slice off the ends? Thoughts? Thanks much...
MJ
Mark Janikas
Product Engineer
ESRI, Geoprocessing
380 New York St.
Redlands, CA 92373
909-793-2853 (2563)
mjani...@esri.com<mailto:mjan
anks again!
MJ
-Original Message-
From: numpy-discussion-boun...@scipy.org
[mailto:numpy-discussion-boun...@scipy.org] On Behalf Of Christopher Barker
Sent: Thursday, April 30, 2009 12:16 PM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Timing array construction
Ma
ring
Sent: Wednesday, April 29, 2009 11:49 PM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Timing array construction
Mark Janikas wrote:
> Hello All,
>
>
>
> I was exploring some different ways to concatenate arrays, and using
> "c_" is the fa
RESULT
N, useAsArray, useArray, useC
100, 0.0066, 0.0065, 0.0007
200, 0.0137, 0.0140, 0.0008
400, 0.0277, 0.0288, 0.0007
800, 0.0579, 0.0577, 0.0008
1600, 0.1175, 0.1289, 0.0009
3200, 0.2291, 0.2309, 0.0012
6400, 0.4561, 0.4564, 0.0013
12800, 0.9218, 0.9122, 0.
0)` ? Doesn't
> it also work without it, or am I missing something in how this works?>
>
> Josef
>
> On 2/10/09, Mark Janikas wrote:
>> Thanks to all for your replies. I want this to work on any vector so I was
>> thinking this...?
>>
>> import numpy as n
th Goodman wrote:
>>> On Tue, Feb 10, 2009 at 11:29 AM, Mark Janikas wrote:
>>>> I want to create an array that contains a column of permutations for each
>>>> simulation:
>>>>
>>>> import numpy as NUM
>>>>
>>>> import
? Thanks so much ahead of time...
MJ
Mark Janikas
Product Engineer
ESRI, Geoprocessing
380 New York St.
Redlands, CA 92373
909-793-2853 (2563)
mjani...@esri.com<mailto:mjani...@esri.com>
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If you do not know the size of your array before you finalize it, then
you should use lists whenever you can. I just cooked up a short
example:
##
import timeit
import numpy as N
values = range(1)
def appendArray(values):
I cant be sure if your issue is related to mine, so I was wondering
where/when you got your numpy build?
My issue:
http://projects.scipy.org/pipermail/numpy-discussion/2007-April/027000.h
tml
Travis has been kind enough to work with me on it. His changes are in
the svn. So, I don't think this i
Is there a way to silently install the numpy.exe from a Microsoft DOS
prompt?
Something like: numpy-1.0.2.win32-py2.4.exe -silent
Thanks ahead of time...
MJ
Mark Janikas
Product Engineer
ESRI, Geoprocessing
380 New York St.
Redlands, CA 92373
909-793-2853 (2563)
[EMAIL
s during
Py_Finalize.
Greg
____
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mark Janikas
Sent: Friday, March 30, 2007 4:55 PM
To: Discussion of Numerical Python
Subject: [Numpy-discussion] Dynamic module not initialized properly
Hello all,
even after I make a
change Not sure whether there is anything I can do from the
scripting side (some alternative form of reload?)... or if I have to
forward it along to the C developers. You have my appreciation ahead of
time.
Mark Janikas
Product Engineer
ESRI, Geoprocessing
380 New Y
Thanks Robert,
All good info as usual. Best wishes,
MJ
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Robert Kern
Sent: Wednesday, February 28, 2007 3:32 PM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Source install
Mark
advance
MJ
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Robert Kern
Sent: Wednesday, February 28, 2007 11:26 AM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Source install
Mark Janikas wrote:
> Hello all,
>
> I have used
nt me to
a platform-independent doc on how to install from the source tar file?
Thanks ahead of time,
MJ
Mark Janikas
Product Engineer
ESRI, Geoprocessing
380 New York St.
Redlands, CA 92373
909-793-2853 (2563)
[EMAIL PROTECTED]
___
Numpy-
: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Greek Letters
Mark Janikas wrote:
> Thanks Robert but alas, I get.
>
>>>> import sys
>>>> sys.stdout.encoding
> 'cp437'
>>>> print u'\u03a7\u00b2'.encode(sys.stdout.e
inal Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mark Janikas
Sent: Tuesday, February 20, 2007 5:16 PM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Greek Letters
Thanks Robert but alas, I get.
>>> import sys
>>> sys.stdout.e
s
Thanks again,
MJ
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert Kern
Sent: Tuesday, February 20, 2007 4:20 PM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Greek Letters
Mark Janikas wrote:
> Hello all,
>
>
f Medicine
On Feb 20, 2007, at 3:56 PM, Mark Janikas wrote:
> Hello all,
>
>
>
> I was wondering how I could print the chi-squared symbol in
> python. I have been looking at the Unicode docs, but I figured I
> would ask for assistance here while I delve into it. Thanks
Hello all,
I was wondering how I could print the chi-squared symbol in python. I
have been looking at the Unicode docs, but I figured I would ask for
assistance here while I delve into it. Thanks for any help in advance.
Mark Janikas
Product Engineer
ESRI, Geoprocessing
380 New York
I wanted to thank all of you who helped me with my making my sparse
matrix representation cross-platform in binary format!
I ended up writing and reading everything explicitly in little endian.
To recap, each row in the matrix is represented by three records:
1) row#, nn (number of no
Found a typo-or-two in my description. #2 and #3 are nnx1 in shape
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mark Janikas
Sent: Tuesday, February 13, 2007 4:31 PM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] fromstring
Numerical Python
Subject: Re: [Numpy-discussion] fromstring, tostring slow?
Mark Janikas wrote:
> I don't think I can do that because I have heterogeneous rows of
> data I.e. the columns in each row are different in length.
like I said, show us your whole problem...
But you do
] On Behalf Of Stefan van der
Walt
Sent: Tuesday, February 13, 2007 3:52 PM
To: numpy-discussion@scipy.org
Subject: Re: [Numpy-discussion] fromstring, tostring slow?
On Tue, Feb 13, 2007 at 03:44:37PM -0800, Mark Janikas wrote:
> I don't think I can do that because I have heterogeneous rows o
on of Numerical Python
Subject: Re: [Numpy-discussion] fromstring, tostring slow?
Mark Janikas wrote:
> I am finding that directly packing numpy arrays into binary using the
> tostring and fromstring methods
For starters, use fromfile and tofile, to save the overhead of creating
an entire e
Yup. It was faster to:
Use lists for the append, then transform into an array, then transform
into a binary string
Rather than
Create empty arrays and use its append method, then transform into a
binary string.
The last question on the output when then be to test the speed of usin
Of Stefan van der
Walt
Sent: Tuesday, February 13, 2007 12:03 PM
To: numpy-discussion@scipy.org
Subject: Re: [Numpy-discussion] fromstring, tostring slow?
On Tue, Feb 13, 2007 at 11:42:35AM -0800, Mark Janikas wrote:
> I am finding that directly packing numpy arrays into binary using the to
ot; is not constant across the records, so many of the database
structures I have looked at do not apply. Any suggestions would be
greatly appreciated.
Mark Janikas
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multiplication
On 1/19/07, Mark Janikas <[EMAIL PROTECTED]> wrote:
Hello all,
I am trying to figure out the most efficient way to get the sum of the
product of two vectors where id != id.
E.g.:
X = array([1,2,3])
Y = array([1,2,3])
Z = (1*2) + (1*3) + (2*1) + (2*3) + (3*1) + (3*2
if there is a
version of multiply that could be used... or a form of vectorize. Any
ideas would be greatly appreciated.
Mark Janikas
Product Engineer
ESRI, Geoprocessing
380 New York St.
Redlands, CA 92373
909-793-2853 (2563)
[EMAIL PROTECTED
Thanks for all the input so far. The only thing that seems odd about
the omission of probability or quantile functions in NumPy is that all
the random number generators are present in RandomArray. At any rate,
hopefully this bit of functionality will be present in the future, but
for now, IMO the
reatly appreciated.
Mark Janikas
Product Engineer
ESRI, Geoprocessing
380 New York St.
Redlands, CA 92373
909-793-2853 (2563)
[EMAIL PROTECTED]
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