Mailman 3 September 2006 - NumPy-Discussion

ndarray.count() ?
by Martin Spacek 12 Sep '06

12 Sep '06

What's the most straightforward way to count, say, the number of 1s or Trues in the array? Or the number of any integer? I was surprised to discover recently that there isn't a count() method as there is for Python lists. Sorry if this has been discussed already, but I'm wondering if there's a reason for its absence. I came across a thread in March: http://aspn.activestate.com/ASPN/Mail/Message/numpy-discussion/3066460 that talked a bit about this in terms of speed, but what about just the convenience of having a count() method? Looks like masked arrays have a count method, don't know much about them though. Also, I understand the inaccuracies when converting between binary and decimal floating point representations, and therefore making counting of a specific float value in an array somewhat undefined, yet it seems to work in Python lists: >>> 1.1 1.1000000000000001 >>> a=[1.1, 1.1, 1.2] >>> a [1.1000000000000001, 1.1000000000000001, 1.2] >>> a.count(1.1) 2 >>> a.count(1.1000000000000001) 2 >>> a.count(1.2) 1 Comments? Martin

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DOE田口式品质工程
by "9月21-22日/上海" 12 Sep '06

12 Sep '06

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sum returns grand total?
by listservs＠mac.com 11 Sep '06

11 Sep '06

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I must have missed something -- since when does summing a multidimensional array return the grand total? I thought that it should sum over axis zero by default (at least, thats what the docs say). Here's what I am getting: (Pdb) pre Out[6]: array([[[ 13, 3, 1, 33, 52], [ 1, 0, 0, 0, 2], [ 4, 0, 0, 2, 6], [ 15, 1, 0, 20, 54]], [[380, 101, 9, 267, 321], [ 20, 4, 0, 7, 16], [ 31, 3, 1, 31, 22], [314, 27, 4, 276, 391]]], dtype=int64) (Pdb) sum(pre) Out[6]: 2432L Is this correct behaviour? - -- Christopher Fonnesbeck + Atlanta, GA + fonnesbeck at mac.com + Contact me on AOL IM using email address -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (Darwin) iD8DBQFFBYSJGKaDpEGshJ0RAiPhAJ0d/MCGMciLgB2ZOwXf1FVj26NpTgCdG7h8 M83+mZsYGP2svVBGn8RtbNw= =mby0 -----END PGP SIGNATURE-----

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rfft different in numpy vs scipy
by Andrew Jaffe 11 Sep '06

11 Sep '06

Hi all, It seems that scipy and numpy define rfft differently. numpy returns n/2+1 complex numbers (so the first and last numbers are actually real) with the frequencies equivalent to the positive part of the fftfreq, whereas scipy returns n real numbers with the frequencies as in rfftfreq (i.e., two real numbers at the same frequency, except for the highest and lowest) [All of the above for even n; but the difference between numpy and scipy remains for odd n.] I think the numpy behavior makes more sense, as it doesn't require any unpacking after the fact, at the expense of a tiny amount of wasted space. But would this in fact require scipy doing extra work from whatever the 'native' real_fft (fftw, I assume) produces? Anyone else have an opinion? Andrew

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DOE田口式品质工程
by "9月21-22日/上海" 10 Sep '06

10 Sep '06

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Your PR man AETR
by whieofvv llolkgcls 10 Sep '06

10 Sep '06

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1.0b5 build failure
by Neal Becker 09 Sep '06

09 Sep '06

Fedora FC5 linux, with BLAS, LAPACK, ATLAS, FFTW compile options: '-Ibuild/src.linux-x86_64-2.4/numpy/core/src -Inumpy/core/include -Ibuild/src.linux-x86_64-2.4/numpy/core -Inumpy/core/src -Inumpy/core/include -I/usr/include/python2.4 -c' gcc: numpy/core/src/multiarraymodule.c numpy/core/src/multiarraymodule.c: In function ‘initmultiarray’: numpy/core/src/multiarraymodule.c:6860: error: ‘NPY_ALLOW_THREADS’ undeclared (first use in this function) numpy/core/src/multiarraymodule.c:6860: error: (Each undeclared identifier is reported only once numpy/core/src/multiarraymodule.c:6860: error: for each function it appears in.) numpy/core/src/multiarraymodule.c: In function ‘initmultiarray’: numpy/core/src/multiarraymodule.c:6860: error: ‘NPY_ALLOW_THREADS’ undeclared (first use in this function) numpy/core/src/multiarraymodule.c:6860: error: (Each undeclared identifier is reported only once numpy/core/src/multiarraymodule.c:6860: error: for each function it appears in.) error: Command "gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fPIC -Ibuild/src.linux-x86_64-2.4/numpy/core/src -Inumpy/core/include -Ibuild/src.linux-x86_64-2.4/numpy/core -Inumpy/core/src -Inumpy/core/include -I/usr/include/python2.4 -c numpy/core/src/multiarraymodule.c -o build/temp.linux-x86_64-2.4/numpy/core/src/multiarraymodule.o" failed with exit status 1

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cobblestone
by Roger Mclaughlin 09 Sep '06

09 Sep '06

We are taught that in the Bible, youremember. Possibly he meant to melt away in the darkness, leaving us in thewilderness to our fate. He did not seem in the least surprised, indeed he said he knew thatthis was so. Why must he be our companion, Macumazahn? In the end I did so, very unwillingly,to please my relations. Well, hereplied, with a twinkle in his eye, if I were you I should go andlook for the lady there. I realizedthis when I made up my mind to continue the journey to Lake Monealone. Also she was rude enoughto believe and to tell me she believed that I was mad. Odd to have met you in this fashion,but so is everything in this place. Do you mean to say that you tried to do that, Mr. Oh, only that I seemed different in every way. No, always when I was awake and looking at the stars, andgenerally when I was in the open air. I willfollow with the wanderer as soon as he can walk. Then he lay down in the tentand fell at once into a profound sleep. My father was cracked on astrology andcast mine when I was born. I suppose I inherited it frommy father, at any rate there it is. Then he lay down in the tentand fell at once into a profound sleep. This pistol is much lighter triggered than I thought or perhaps theheat has affected the spring. From that moment, for example, I hated thedissipations which had attracted me. Go with them to the borders of the lake, where perchanceone will meet you. From that moment, for example, I hated thedissipations which had attracted me. Indeed, you would be wise to turnback, for I think that death is very fond of Lake Mone. There you will find those who will guideyou. He did not seem in the least surprised, indeed he said he knew thatthis was so. Lastly it was necessary to provide him withone of the spare Winchester rifles and some cartridges. Quatermain, I am adreamer and what is called a mystic.

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gdal numpy/numeric/matplotlib problem
by Didrik Pinte 09 Sep '06

09 Sep '06

Hi, I am running a Debian/Sid system and face a problem when using the gdal python bindinds. The gdal python bindings are linked with Numeric. In one of my application i'm using some numpy methods. This is working fine BUT when I add the use of the matploblib library to my application all the calls to gdal specific methods are broken. I have attached a basic example. The first test fails if I import the pylab module. The second one that can be run with any shapefile shows that when pylab is loaded, some GDAL methods raises GEOS exceptions. Commenting the "import pylab" line shows that without pylab there is no exceptions, nor problems. They are two workarounds : [1] a real one : using matplotlib with the Numeric lib [2] a fake one : renaming /usr/lib/python2.4/site-packages/numpy/core/multiarray.so to another name, the tests does not fail. Does anybody have a suggestion to correct this problem ? I can provide more details if needed. Best regards, -- Didrik

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regurgitation
by Sadie Craft 09 Sep '06

09 Sep '06

Is it really true that no influence is ever brought to bear onanybody about anything? If Diana did want anything youd be on the spot. Andchanging her tone, she said coldly: After all, Captain Cherrellis a D. A good many, said Dinny, seem to drop first, and then do therunning. She did not talk, however,leaving him to begin if he wished. Personally, I dontbelieve Aunt May can put us up. Especially when theyve been to the same school. Not more than I am, dont worry about that. Its as good a place, I suppose, asyou could find. Arrived at Shropshire House Sir Lawrence said:Can we see the Marquess, Pommett? Her knowledge of London was small, and she hailed the first cab. She passed Dinny andAdrian as they were coming in. The man came in again and drewthe curtains. Itrepresented with a moderate degree of certainty a young womanwithout clothes. The man came in again and drewthe curtains. Is your extradition really likely,Hubert? The hat ropes did it, Dinny, and let me tell you that the grapeshave been sour ever since. Professor Hallorsen was expected in at five and should at once begiven the message. Lord Saxenden knows me, and raisedher eyes. I shall sleep with my emergency suit-case; one can always get a taxi here at a moments notice. Shake hands, Millie, and remember what I said. Then, swiftly, looking neither to left nor right, she returned toAdrian. Go off your chump, Cherrell,then youll know what it means to be lonely for the rest of yourdays. But privilege is only justified nowadays byrunning till you drop. Your Auntnever ceases to throw them in my teeth. Puzzlin, theyheard her say as they entered the library. Either Im over-sensitive, Dinny, or this particular afflictiondoes seem to me too dreadful. She bent her head, and still didnt speak.

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NumPy-Discussion September 2006