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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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