Question


Are the values in each compressed column of a sparse matrix stored in order?
If I have a sparse column vector (e.g. a column of a sparse matrix), and I'm accessing the elements of that vector in a mex file...

3 years ago | 1 answer | 0

1

answer

Question


Debugging C++ mex files in Xcode 7 on El Capitan
I have just migrated to MAC OS, and am trying to debug a mex file for the first time. I'm using MATLAB R2015b and Xcode 7.0.1 on...

3 years ago | 2 answers | 1

2

answers

Question


How do *you* debug mex files on Mac OS
I'm having trouble <http://uk.mathworks.com/matlabcentral/answers/249023-debugging-c-mex-files-in-xcode-7-on-el-capitan debuggin...

3 years ago | 2 answers | 2

2

answers

Answered
imagesc() Y Axis Log Scale Not Working (Help!)
If you want to avoid pcolor, you can resample the image at the log scale locations, then use imagesc to display that.

3 years ago | 0

Submitted


Bitcount & bitwise hamming distance
Count the set bits in vectors, and compute bitwise hamming distances between sets of vectors

4 years ago | 2 downloads |

Answered
Which MATLAB operations/functions need speeding up?
TYPECAST Typecast uses a deep copy rather than a shared data copy, as explained by James Tursa in his <http://www.mathworks.c...

4 years ago | 0

Submitted


Figure control widget
Intuitive manipulation of a figure using key and mouse gestures

4 years ago | 3 downloads |

Question


Is A./B different from B.\A?
Given two matrices, A and B, will A./B ever give a different answer from B.\A, or are these two expressions equivalent? It se...

4 years ago | 2 answers | 1

2

answers

Answered
Which MATLAB operations/functions need speeding up?
IMFILTER with separable filters on multi-channel images. This particular use case of imfilter is actually slower than using c...

4 years ago | 0

Answered
Which MATLAB operations/functions need speeding up?
It needs a NOP function - a builtin function which does absolutely nothing, but extremely quickly. In compiled languages like...

4 years ago | 0

Answered
Creating movie from Images from a for loop
Produce your images programmatically, rather than by exporting a figure, if you can, as it will be much faster. <http://www.math...

4 years ago | 0

| accepted

Question


Given a named function, how can I call this function, and not the subfunction of the same name?
My function is passed the name of a function (as a string). It just so happens that my function contains a subfunction of that n...

4 years ago | 3 answers | 0

3

answers

Answered
combining many RGB images into one image
You can display a cell array of images using <http://www.mathworks.com/matlabcentral/fileexchange/22387-imdisp imdisp>. imdi...

4 years ago | 0

Answered
In mex files, where does output to stdout and stderr go?
In a C++ mex file you can output std::cout to the command line, by putting the following code somewhere in your mex file: c...

4 years ago | 2

Answered
scatter plot with 4 different background color
figure; im = rand(2, 2, 3); image([0 1], [0 1], im); hold on a = rand(10,1); b = rand(10,1); scatter(a, b); The...

4 years ago | 0

Answered
How to optimize this matlab code?
Use <http://www.mathworks.com/matlabcentral/fileexchange/8773 multiprod> as follows: y = reshape(multiprod(multiprod(W_matr...

4 years ago | 0

| accepted

Answered
How to determine the MATLAB version when compiling C/C++ mex files
matrix.h contains the following: #define MX_API_VER 0x07040000

4 years ago | 0

Question


How to determine the MATLAB version when compiling C/C++ mex files
MATLAB's C/C++ mex interface changes from time to time, with new releases of MATLAB. Functionality can be added, removed or chan...

4 years ago | 4 answers | 1

4

answers

Submitted


betafit_fast
Quickly compute the parameters of a beta distribution

4 years ago | 1 download |

Answered
Which MATLAB operations/functions need speeding up?
CROSS It is shameful how slow this basic function is. I wrote my own (still in standard MATLAB), and it was 5 times faster. B...

4 years ago | 1

Answered
What features and improvements do you hope to see in HG2?
Texture mapping of arbitrary meshes. See <http://www.mathworks.com/matlabcentral/answers/183980-how-can-i-texture-map-an-arbitra...

4 years ago | 0

Question


How can I texture map an arbitrary mesh
Surf() and surface() allow me to texture map a regular quadrangular mesh. How can I texture map an irregular triangular mesh, of...

4 years ago | 0 answers | 0

0

answers

Submitted


SC - powerful image rendering
Useful tool for rendering and outputting information rich images

4 years ago | 33 downloads |

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Question


Fastest way to compute J' * J, where J is sparse
I have a sparse rectangular matrix, J, for which I want to compute: >> H = J' * J; It's a bit slow (transpose is taking ...

4 years ago | 2 answers | 1

2

answers

Answered
What features and improvements do you hope to see in HG2?
Some volume rendering capabilities, similar to <http://www.voreen.org/ voreen>.

5 years ago | 0

Answered
What features and improvements do you hope to see in HG2?
Support for all fonts, not a limited subset, in vector graphics export.

5 years ago | 1

Answered
What features and improvements do you hope to see in HG2?
Support for transparency and lighting in vector graphics export.

5 years ago | 0

Answered
What features and improvements do you hope to see in HG2?
MUCH faster rendering. For example, MATLAB renders a million points of different colors incredibly slowly. I reckon some well...

5 years ago | 1

Answered
What features and improvements do you hope to see in HG2?
Anti-aliased graphics.

5 years ago | 1

Answered
What features and improvements do you hope to see in HG2?
Set a colormap per axes instead of per figure. This would make it much simpler to use multiple colormaps in the same figure.

5 years ago | 2

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