Extractions: Load data from a text file. Each row in the text file must have the same number of values. Parameters : fname : file or str File or filename to read. If the filename extension is .gz or , the file is first decompressed. dtype : data-type, optional Data-type of the resulting array; default: float. If this is a record data-type, the resulting array will be 1-dimensional, and each row will be interpreted as an element of the array. In this case, the number of columns used must match the number of fields in the data-type. comments : str, optional delimiter : str, optional The string used to separate values. By default, this is any whitespace. converters : dict, optional A dictionary mapping column number to a function that will convert that column to a float. E.g., if column is a date string: converters . Converters can also be used to provide a default value for missing data: converters lambda s: float(s or . Default: None. skiprows : int, optional
Numpy Example List With Doc - loadtxt() log() log10() log1p() log2() logical_and() logical_not() logical_or() logical_xor() logspace() lookfor() lstsq() mat() matrix() max() maximum() maximum_sctype() http://www.scipy.org/Numpy_Example_List_With_Doc
Extractions: Search: This is an auto-generated version of Numpy Example List with added documentation from doc strings and arguments specification for methods and functions of Numpy 1.2.1. Please do not edit this page directly. To update this page just follow the instructions from numpy import a arange a a reshape print a a # same as a[:,:,0] array a # same as a[1:,:,:] or just a[1:] array See also: newaxis from numpy import a array a # indices start by zero a # last row array a # subarray array i array # array of indices for the first axis j array # array of indices for the second axis a i j array a a # boolean indexing array array True False True False # boolean row selector a array array False True True False True # boolean column selector a array See also: newaxis indices nonzero where ... slice ndarray .T Examples array([[ 1., 3.]
Help Formatting In Numpy.loadtxt - Python I need to read in a large amount of data from a csv file into arrays. I am using Numpy as I need to later manipulate and plot the results. I have decided to use numpy.loadtxt as http://www.daniweb.com/forums/thread245873.html
Extractions: /** * vBulletin 3.8.2 CSS * Style: 'Software Development'; Style ID: 6 */ @import url("/forums/clientscript/vbulletin_css/style-1ac307d6-00006.css"); @import url("/rxrimages/danicss.css"); Top Members by Rank Similar Threads Permalink Dec 12th, 2009 I need to read in a large amount of data from a csv file into arrays. I am using Numpy as I need to later manipulate and plot the results. I have decided to use numpy.loadtxt as this appears to be the most efficient method to read in the data. I can read the data into one big string array but I am struggling to convert the data as I read it in.
NumPy 1.5.0 Beta 2 - Changelog - Softpedia 905 numpy.loadtxt usecols argument no longer accepts numpy arrays 906 Deepcopy does not copy _mask attribute of a masked array object http://mac.softpedia.com/progChangelog/NumPy-Changelog-37788.html
CreativeCOW _root.preloader.loadtxt.text = percentageOutput + % if (loadedBytes!=totalBytes) {gotoAndPlay(2);} else {gotoAndStop(5);} then on frame 2 I have this http://forums.creativecow.net/readpost/190/858491
Extractions: Load data from a text file. Each row in the text file must have the same number of values. Parameters: fname : file or str File or filename to read. If the filename extension is .gz or , the file is first decompressed. dtype : dtype, optional Data type of the resulting array. If this is a record data-type, the resulting array will be 1-dimensional, and each row will be interpreted as an element of the array. In this case, the number of columns used must match the number of fields in the data-type. comments : str, optional The character used to indicate the start of a comment. delimiter : str, optional The string used to separate values. By default, this is any whitespace. converters : dict, optional A dictionary mapping column number to a function that will convert that column to a float. E.g., if column is a date string: converters . Converters can also be used to provide a default value for missing data: converters lambda s: float(s or skiprows : int, optional
[Numpy-discussion] Loadtxt And Genfromtxt I am new to python/numpy/scipy and new to this list. I recently migrated over from using Octave and am very impressed so far! Recently I needed to load data from a text file and http://www.mail-archive.com/numpy-discussion@scipy.org/msg23572.html
Speed Up A Numpy Code With Huge Array * V=numpy.loadtxt(pathV) * VTOT = V0 * L3 = V1 * print 'using ' + vtet else * NN= * B=0,0,0,0 * for i in range(len(N)) * * * * B0 = Ni.label http://www.velocityreviews.com/forums/t724028-speed-up-a-numpy-code-with-huge-ar
Using Numpy Dtype With Loadtxt « Physicsnlinux Mar 3, 2010 then give this as input to loadtxt to load the file and create the array. No Responses Yet to “using numpy dtype with loadtxt” http://physicsnlinux.wordpress.com/2010/03/03/using-numpy-dtype-with-loadtxt/
Extractions: Search: Opened 2 years ago Last modified 2 years ago Reported by: rmay Owned by: somebody Priority: normal Milestone: Component: numpy.lib Version: Keywords: patch Cc: t appears that the usecols argument to loadtxt no longer accepts numpy arrays: ValueError? Traceback (most recent call last) /usr/lib64/python2.5/site-packages/numpy/lib/io.py in loadtxt(fname, dtype, comments, delimiter, converters, skiprows, usecols, unpack) 326 327 dtype_types = flatten_dtype(dtype) ValueError? array([[ 2., 3.], Before the fix and refactoring of loadtxt in 1.1.1, converting to a list was not necessary. I think the assumptions just kind of cropped in (exploiting certain list functionality like list.find for ease of code). I've attached a simple patch against HEAD that does the obvious fix and converts usecols to a list if it's not None. This should allow almost any iterable (including tuples, which are also currently broken but used in the docstring) to be passed in to usecols.
Physicsnlinux parallel computing the python way; quaternions for python; change permission recursively to folders only; aptitude search ‘and’ using numpy dtype with loadtxt http://physicsnlinux.wordpress.com/
Loadtxt - Swartz Center For Computational Neuroscience loadtxt, Load ascii text file into numeric or cell arrays See the matlab file loadtxt.m (may require other functions) Back to functions. http://sccn.ucsd.edu/eeglab/allfunctions/loadtxt.html
Touchcomic.googlecode.com loadtxt() def loadtxt() global filenm. global drive_letter,drive_folder. z=None. tf= files=map(unicode,os.listdir(drive_letter+ \\ +drive_folder) http://touchcomic.googlecode.com/files/txt_convertor.py
Question About Arrays - Python The numpy.loadtxt() call is not right because of your from..import form, but I suspect that's an artifact of repeated tries. Just loadtxt(), but that doesn't work either. http://www.daniweb.com/forums/thread90745.html
Extractions: /** * vBulletin 3.8.2 CSS * Style: 'Software Development'; Style ID: 6 */ @import url("/forums/clientscript/vbulletin_css/style-1ac307d6-00006.css"); @import url("/rxrimages/danicss.css"); Top Members by Rank Similar Threads Permalink Sep 25th, 2007 alright, so i'm trying to import text from a file into an array so that I have the ability to edit data, find certain functions, etc.
Frequently Asked Questions — SciPy Use numpy.loadtxt(). Even if your text file has header and footer lines or comments, loadtxt can almost certainly read it; it is convenient and efficient. http://new.scipy.org/faq.html
Extractions: Where to get help NumPy and SciPy Project Mailing Lists $('#searchbox').show(0); General questions about NumPy What is NumPy? Why should I use NumPy rather than IDL, MATLAB, Octave, or Yorick? What is a NumPy array? ... NumPy is a Python extension module that provides efficient operation on arrays of homogeneous data. It allows python to serve as a high-level language for manipulating numerical data, much like IDL, MATLAB, or Yorick. sui generis programming language, and it is relatively easy to connect existing C and Fortran code to the Python interpreter. A NumPy array is a multidimensional array of objects all of the same type. In memory, it is an object which points to a block of memory, keeps track of the type of data stored in that memory, keeps track of how many dimensions there are and how large each one is, and - importantly - the spacing between elements along each axis. For example, you might have a NumPy array that represents the numbers from zero to nine, stored as 32-bit integers, one right after another, in a single block of memory. (for comparison, each Python integer needs to have some type information stored alongside it). You might also have the array of even numbers from zero to eight, stored in the same block of memory, but with a gap of four bytes (one 32-bit integer) between elements. This is called
Discussion Of Numerical Python I find that loadtxt is rather slow. Is this to be expected? Probably. You don't say exactly what you mean by slow , so it's difficult to tell. http://blog.gmane.org/gmane.comp.python.numeric.general/month=20090301
Extractions: I'm subclassing Numpy's MaskedArray to create a data class that handles missing data, but adds some extra info I need to carrry around. However I've been having problems keeping this extra info attached to the subclass instances after performing operations on them. The bare-bones script that I've copied here shows the basic issue: http://pastebin.com/f69b979b8 There are 2 classes: one where I am able to subclass numpy (with help from the great description at http://www.scipy.org/Subclasses ), and the other where I subclass numpy.ma
Scipy Stats Project: May 2009 All of the functions loadtxt, recfromcsv, recfromtxt, etc. use genfromtxt they just have different default values for the keyword arguments. http://scipystats.blogspot.com/2009_05_01_archive.html
