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Questions tagged matrix

130 questions · page 2 of 3

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9
votes
3
answers

Dense Cholesky update in Python

python matrix numpy lapack factorization
asked 2011-12-26T14:14:37.277
25
votes
6
answers

Numpy matrix power/exponent with modulo?

python matrix modulo exponent
asked 2011-12-15T02:54:18.310
15
votes
4
answers

Type-safe matrix multiplication

haskell matrix matrix-multiplication
asked 2011-11-30T20:17:18.080
11
votes
2
answers

How to remove duplicate rows from matrix

arrays matlab matrix duplicates
asked 2011-11-10T21:07:37.093
11
votes
2
answers

Android ImageView - Get coordinates of tap (click) regardless of scroll location or zoom scale

android matrix imageview coordinates
asked 2011-11-03T21:44:45.077
11
votes
2
answers

Importing Modules that use MultiProcessing Python

python import matrix parallel-processing multiprocessing
asked 2011-11-03T00:50:55.557
12
votes
4
answers

Turning a Large Matrix into a Grayscale Image

python image matrix grayscale
asked 2011-10-08T04:10:41.990
93
votes
4
answers

Elegant indexing up to end of vector/matrix

r matrix dataframe indexing
asked 2011-09-21T13:33:21.953
23
votes
4
answers

Why does the order of loops in a matrix multiply algorithm affect performance?

c algorithm matrix matrix-multiplication gprof
asked 2011-09-13T00:29:08.897
49
votes
5
answers

How to apply function over each matrix element's indices

r function dictionary matrix apply
asked 2011-09-12T23:58:12.113
20
votes
4
answers

Vector norm of an array of vectors in MATLAB

arrays matlab matrix vectorization normalization
asked 2011-08-26T19:16:53.073
28
votes
4
answers

Index values from a matrix using row, col indices

r indexing matrix r-faq
asked 2011-08-03T00:41:37.993
11
votes
2
answers

What is the most efficient way to construct large block matrices in Mathematica?

matrix wolfram-mathematica
asked 2011-07-28T23:40:42.963
97
votes
16
answers

Convert a matrix to a list of column-vectors

list r matrix
asked 2011-07-25T17:08:08.570
13
votes
3
answers

Is there a fast way to invert a matrix in Matlab?

algorithm matlab matrix performance matrix-inverse
asked 2011-06-28T15:50:33.763
9
votes
1
answers

Transform 3D points to 2D

math matrix 3d
asked 2011-06-07T11:42:58.973
9
votes
1
answers

Adding 2 matrix and Multiplying 2 matrix in python by using scipy/numpy

python math matrix numpy scipy
asked 2011-05-23T02:53:21.553
17
votes
2
answers

numpy: inverting an upper triangular matrix

python matrix numpy scipy matrix-inverse
asked 2011-05-18T09:09:55.880
39
votes
7
answers

Finding the null space of a matrix

numpy matrix scipy linear-algebra svd
asked 2011-05-04T19:56:16.647
17
votes
3
answers

Convert and save distance matrix to a specific format

r csv matrix distance
asked 2011-04-28T03:08:44.313
10
votes
4
answers

3D Matrix multiplication with vector

matlab matrix vector
asked 2011-04-15T19:03:07.173
13
votes
2
answers

Interpolating between rotation matrices

opengl matrix rotation interpolation
asked 2011-04-07T11:27:18.717
16
votes
5
answers

Check for positive definiteness or positive semidefiniteness

python math matrix scipy linear-algebra
asked 2011-04-06T08:51:25.767
17
votes
3
answers

How to solve this linear programing problem?

algorithm caching tree matrix
asked 2011-04-01T02:12:18.447
29
votes
3
answers

Using WebGL Shader Language (GLSL) for arbitrary vector mathematics in JavaScript

javascript math matrix glsl webgl
asked 2011-03-24T03:42:03.743
18
votes
3
answers

A loopless 3D matrix multiplication in python

python matrix numpy operation
asked 2011-03-17T20:28:18.360
11
votes
3
answers

How to compare a matrix element with its neighbours without using a loop in MATLAB?

matlab image-processing matrix
asked 2011-02-18T14:39:22.703
15
votes
3
answers

Is there a good PHP library for vectors and matrices?

php vector matrix
asked 2011-01-28T12:32:26.780
13
votes
3
answers

Mapping elements in 2D upper triangle and lower triangle to linear structure

c++ arrays algorithm matrix indexing
asked 2011-01-26T09:52:50.503
36
votes
5
answers

Vectorizing a matrix

r vector statistics matrix
asked 2010-12-31T14:13:22.787
15
votes
8
answers

What's a good C++ library for matrix operations

c++ optimization matrix
asked 2010-12-30T11:32:34.273
77
votes
11
answers

All Levels of a Factor in a Model Matrix in R

r matrix model indicator
asked 2010-12-30T06:18:17.157
12
votes
2
answers

Correct OpenGL matrix format?

math opengl matrix
asked 2010-12-05T20:18:19.963
12
votes
4
answers

Combine Rotation Axis Vectors

math vector 3d matrix quaternions
asked 2010-11-30T17:42:58.080
86
votes
8
answers

Android: How to rotate a bitmap on a center point

android matrix bitmap center image-rotation
asked 2010-11-12T16:38:32.243
14
votes
4
answers

What is the best way to extract a diagonal from a matrix in Haskell?

algorithm haskell matrix
asked 2010-10-22T16:27:30.223
108
votes
7
answers

Sum rows in data.frame or matrix

r dataframe matrix rowsum
asked 2010-10-21T21:02:01.087
11
votes
4
answers

Find the index of the last non-zero element in each row of a given matrix?

arrays matlab matrix
asked 2010-10-11T22:02:02.590
15
votes
3
answers

3D rotation with Axis & Angle

javascript actionscript-3 3d matrix rotation
asked 2010-09-28T04:56:02.140
29
votes
1
answers

How do I remove elements at a set of indices in a vector in MATLAB?

arrays matlab matrix matrix-indexing
asked 2010-09-24T18:18:05.730
9
votes
5
answers

transforming a matrix into a vector along its diagonals

algorithm matlab matrix transform
asked 2010-08-09T13:50:39.803
13
votes
3
answers

How can I index a 3-D matrix with a 2-D mask in MATLAB?

matlab indexing matrix
asked 2010-08-04T16:15:49.203
12
votes
3
answers

Does Global Work Size Need to be Multiple of Work Group Size in OpenCL?

matrix gpu opencl gpgpu
asked 2010-06-30T09:24:23.600
10
votes
1
answers

How can I accumulate cells of different lengths into a matrix in MATLAB?

matlab matrix cell-array
asked 2010-06-16T14:54:54.127
13
votes
7
answers

Last Observation Carried Forward In a data frame?

r matrix apply dataframe
asked 2010-05-05T19:22:53.070
20
votes
2
answers

the easiest way to convert matrix to one row vector

matlab matrix
asked 2010-04-28T15:24:50.147
18
votes
2
answers

Replace empty cells with logical 0's before cell2mat in MATLAB

matlab matrix cell-array is-empty
asked 2010-04-12T17:29:30.073
13
votes
2
answers

How can I save and read from XML the new C++ style matrix objects in OpenCV?

xml matrix opencv
asked 2010-04-12T11:51:04.627
11
votes
2
answers

How to convert a grayscale matrix to an RGB matrix in MATLAB?

image matlab matrix rgb grayscale
asked 2010-04-12T03:04:20.173
12
votes
3
answers

converting a matrix to a list

list r matrix
asked 2010-03-18T15:45:58.603
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