python Programming Glossary: matrix

http://stackoverflow.com/questions/1053928/python-numpy-very-large-matrices

to struggle with anything much larger trying to create a matrix of 50000x50000 fails . Obviously this is because of the massive.. some way without having several terrabytes of RAM python matrix numpy share improve this question PyTables and numpy are..

Python: tf-idf-cosine: to find document similarity

http://stackoverflow.com/questions/12118720/python-tf-idf-cosine-to-find-document-similarity

tfidf.todense as a result of above code I have following matrix Fit Vectorizer to train set 1 0 1 0 0 1 0 1 Transform Vectorizer.. .fit_transform twenty.data tfidf 11314x130088 sparse matrix of type ' type 'numpy.float64' ' with 1787553 stored elements.. tfidf vectors are already row normalized. The scipy sparse matrix API is a bit weird not as flexible as dense N dimensional numpy..

Working with big data in python and numpy, not enough ram, how to save partial results on disc?

http://stackoverflow.com/questions/16149803/working-with-big-data-in-python-and-numpy-not-enough-ram-how-to-save-partial-r

of my data I run out of ram. Of course I do creating the matrix for pairwise distances on 200k data takes alot of memory. Here..

Principal component analysis in Python

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

slower than computing the eigenvectors of the covariance matrix. I was hoping to find a premade debugged implementation that..

Numpy meshgrid in 3D

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

arrays with the elements of `x` and y repeated to fill the matrix along the first dimension for `x` the second for `y`. See Also..

A Transpose/Unzip Function in Python (inverse of zip)

http://stackoverflow.com/questions/19339/a-transpose-unzip-function-in-python-inverse-of-zip

4 Is there a builtin function that does that python list matrix unzip transpose share improve this question zip is its own..

Decimal place issues with floats and decimal.Decimal

http://stackoverflow.com/questions/286061/decimal-place-issues-with-floats-and-decimal-decimal

of precision with floats. For example I need to solve a matrix 4.0x 2.0y 1.0z 11.0 1.0x 5.0y 3.0z 6.0 2.0x 2.0y 5.0z 7.0 This.. 2.0x 2.0y 5.0z 7.0 This is the code I use to import the matrix from a text file f open 'gauss.dat' lines f.readlines f.close.. Here is the code I use to rearrange the equations. b is a matrix of coefficients and y is the answer vector def equations b y..

plotting results of hierarchical clustering ontop of a matrix of data in python

http://stackoverflow.com/questions/2982929/plotting-results-of-hierarchical-clustering-ontop-of-a-matrix-of-data-in-python

results of hierarchical clustering ontop of a matrix of data in python How can I plot a dendrogram right on top.. in python How can I plot a dendrogram right on top of a matrix of values reordered appropriately to reflect the clustering.. my dendrogram and perform hierarchical clustering on a matrix of data. How can I then plot the data as a matrix where the..

Matrix Transpose in Python

http://stackoverflow.com/questions/4937491/matrix-transpose-in-python

Transpose in Python I am trying to create a matrix transpose function for python but I can't seem to make it work... into rows. I made this so far but it doesn't work def matrixTranspose anArray transposed None len anArray 0 for t in range..

How to apply numpy.linalg.norm to each row of a matrix?

http://stackoverflow.com/questions/7741878/how-to-apply-numpy-linalg-norm-to-each-row-of-a-matrix

to apply numpy.linalg.norm to each row of a matrix I have a 2D matrix and I want to take norm of each row. But.. numpy.linalg.norm to each row of a matrix I have a 2D matrix and I want to take norm of each row. But when I use numpy.linalg.norm.. X directly it takes the norm of the whole matrix. I can take norm of each row by using a for loop and then taking..

What is different between all these OpenCV Python interfaces?

http://stackoverflow.com/questions/10417108/what-is-different-between-all-these-opencv-python-interfaces

arrays like images. See the article Difference between Matrix Arithmetic in OpenCV and Numpy to know more. Contours returned..

Matrix Multiplication in python?

http://stackoverflow.com/questions/10508021/matrix-multiplication-in-python

Multiplication in python I'm trying to multiply two matrices..

Matrix from Python to MATLAB

http://stackoverflow.com/questions/1095265/matrix-from-python-to-matlab

from Python to MATLAB I'm working with Python and MATLAB right..

Differential Operator usable in Matrix form, in Python module Sympy

http://stackoverflow.com/questions/15463412/differential-operator-usable-in-matrix-form-in-python-module-sympy

Operator usable in Matrix form in Python module Sympy We need two matrices of differential.. matrices of differential operators B and C such as B sympy.Matrix D x D y D y D x C sympy.Matrix D x D y ans B sympy.Matrix x.. B and C such as B sympy.Matrix D x D y D y D x C sympy.Matrix D x D y ans B sympy.Matrix x y 2 x 2 y print ans x 2 y 2 4..

Python Inverse of a Matrix

http://stackoverflow.com/questions/211160/python-inverse-of-a-matrix

Inverse of a Matrix How do I get the inverse of a matrix in python I've implemented.. a row vector . print A.T # Transpose of A. print A x # Matrix multiplication of A and x. print A.I # Inverse of A. print..

Matrix and array multiplication in numpy

http://stackoverflow.com/questions/3890621/matrix-and-array-multiplication-in-numpy

and array multiplication in numpy The numpy docs recommend..

What are the differences between numpy arrays and matrices? Which one should I use?

http://stackoverflow.com/questions/4151128/what-are-the-differences-between-numpy-arrays-and-matrices-which-one-should-i-u

dimensional while numpy arrays ndarrays are N dimensional. Matrix objects are a subclass of ndarray so they inherit all the attributes..

RGB to HSV conversion using PIL

http://stackoverflow.com/questions/4554627/rgb-to-hsv-conversion-using-pil

Paul Haeberli 's online computer graphics notebook titled Matrix Operations for Image Processing which describes how to do a..

Matrix Transpose in Python

http://stackoverflow.com/questions/4937491/matrix-transpose-in-python

Transpose in Python I am trying to create a matrix transpose..

How to define Two-dimensional array in python

http://stackoverflow.com/questions/6667201/how-to-define-two-dimensional-array-in-python

dimensional array without an initalized length like this Matrix but it does not work. I tried this but it is wrong too Matrix.. but it does not work. I tried this but it is wrong too Matrix 5 5 Matrix 5 5 # Recall 2nd parameter to zeros is the type IndexError.. does not work. I tried this but it is wrong too Matrix 5 5 Matrix 5 5 # Recall 2nd parameter to zeros is the type IndexError list..

numpy arbitrary precision linear algebra

http://stackoverflow.com/questions/6876377/numpy-arbitrary-precision-linear-algebra

from sympy import exp N S from sympy.matrices import Matrix data S 800.21 S 600.00 S 600.00 S 1000.48 m Matrix data ex m.applyfunc.. import Matrix data S 800.21 S 600.00 S 600.00 S 1000.48 m Matrix data ex m.applyfunc exp .applyfunc lambda x N x 100 vecs ex.eigenvects..