python Programming Glossary: dimensions

What is the equivalent of MATLAB's repmat in NumPy

http://stackoverflow.com/questions/1721802/what-is-the-equivalent-of-matlabs-repmat-in-numpy

of repmat a m n is tile a m n . This works with multiple dimensions and gives a similar result to matlab. Numpy gives a 3d output..

Principal component analysis in Python

http://stackoverflow.com/questions/1730600/principal-component-analysis-in-python

SVD because my input data are quite high dimensional ~460 dimensions so I think SVD will be slower than computing the eigenvectors..

Numpy meshgrid in 3D

http://stackoverflow.com/questions/1827489/numpy-meshgrid-in-3d

grid. What is the easiest way to extend this to three dimensions So given three vectors x y and z construct 3x3D arrays instead.. I extended the pattern to an arbitrary number of dimensions but this code is by no means optimized and not thoroughly error..

Solving embarassingly parallel problems using Python multiprocessing

http://stackoverflow.com/questions/2359253/solving-embarassingly-parallel-problems-using-python-multiprocessing

connection etc. . We can parallelize the program in two dimensions Part 2 can run on multiple cores since each calculation is independent..

Numpy interconversion between multidimensional and linear indexing

http://stackoverflow.com/questions/3257619/numpy-interconversion-between-multidimensional-and-linear-indexing

collection of N particles each assigned 5 float values dimensions giving an Nx5 array. I then bin each dimension using numpy.digitize..

SciPy Create 2D Polygon Mask

http://stackoverflow.com/questions/3654289/scipy-create-2d-polygon-mask

standard Python packages. input polygon vertices image dimensions output binary mask of polygon numpy 2D array Larger context..

How to write a multidimensional array to a text file?

http://stackoverflow.com/questions/3685265/how-to-write-a-multidimensional-array-to-a-text-file

savetxt isn't quite as great an option for arrays with 2 dimensions... But just to draw everything out to it's full conclusion I.. that numpy.savetxt chokes on ndarrays with more than 2 dimensions... This is probably by design as there's no inherently defined.. there's no inherently defined way to indicate additional dimensions in a text file. E.g. This a 2D array works fine import numpy..

Non biased return a list of n random positive numbers (>=0) so that their sum == total_sum

http://stackoverflow.com/questions/3959021/non-biased-return-a-list-of-n-random-positive-numbers-0-so-that-their-sum

1. Calculate V U S. The solution is similar for higher dimensions uniformly distributed points within a portion of the hyperplane..

Python: Numpy array help. Is there a function to return the first index of something in an array?

http://stackoverflow.com/questions/432112/python-numpy-array-help-is-there-a-function-to-return-the-first-index-of-somet

then all the column indices. For example if array is two dimensions and it contained your item at two locations then array itemindex..

python library for splitting video

http://stackoverflow.com/questions/4580576/python-library-for-splitting-video

while Condition1 # Need a frame to get the output video dimensions frame cv.RetrieveFrame capture # Will return None if there are..

Multivariate spline interpolation in python/scipy?

http://stackoverflow.com/questions/6238250/multivariate-spline-interpolation-in-python-scipy

number of points scattered throughout the domain. For two dimensions I have been using scipy.interpolate.RectBivariateSpline and.. dict arrowstyle ' ' ha 'right' plt.show To do this in n dimensions we just need to pass in the appropriate sized arrays import..

Benchmarking (python vs. c++ using BLAS) and (numpy)

http://stackoverflow.com/questions/7596612/benchmarking-python-vs-c-using-blas-and-numpy

I implemented a matrix matrix multiplication for different dimensions i . i runs from 5 to 500 with an increment of 5 and the matricies..

What does the Python Ellipsis object do?

http://stackoverflow.com/questions/772124/what-does-the-python-ellipsis-object-do

multidimensional array type. Since there are more than one dimensions slicing becomes more complex than just a start and stop index.. stop index it is useful to be able to slice in multiple dimensions as well. E.g. given a 4x4 array the top left area would be defined.. here to indicate a placeholder for the rest of the array dimensions not specified. Think of it as indicating the full slice for..

What's the simplest way to extend a numpy array in 2 dimensions?

http://stackoverflow.com/questions/877479/whats-the-simplest-way-to-extend-a-numpy-array-in-2-dimensions

the simplest way to extend a numpy array in 2 dimensions I have a 2d array that looks like this XX xx What's the most..