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Oliver Woodford


Active since 2011

Programming Languages:
Python, C++, C, MATLAB
Spoken Languages:
English

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Answered
Exporting images (png) through export_fig - painfully slow
Reducing the level of anti-aliasing will reduce the sixe of the images created, saving time. Use the '-aX' option, where X is 1 ...

1 month ago | 0

Answered
export_fig Transparency
The answer is in the help text you shared (you just want the axes color to be white, not none): fig = figure; plot(rand(5)) t...

1 month ago | 0

Answered
Changing image rendering?
Basically you are rendering a binary image, and you're getting gray levels instead of just black and white? What are you using ...

1 year ago | 0

Question


When does an update to a function come into effect?
If I edit an existing function, and save the file, when does that change come into effect, in the following scenarios: Code is ...

2 years ago | 0 answers | 2

0

answers

Answered
Matlab editor doubt - edit running code
In more recent versions of MATLAB, if you drag a file from a folder into the editor window, that file will open immediately, eve...

2 years ago | 0

Question


How can I render points in 3D such that they correctly occlude each other
When I use plot3() to render points (using the OpenGL renderer, in hardware mode, with full hardware support), the occlusion of ...

2 years ago | 0 answers | 0

0

answers

Answered
How to display 70 128*128 images in Matlab from a mat file
The imdisp method in the <https://www.mathworks.com/matlabcentral/fileexchange/16233-sc-powerful-image-rendering sc> FEX submiss...

3 years ago | 0

Answered
Plot 2D images in 3D scatter plot
h = surface(X, Y, Z, im, 'facecolor', 'texturemap', 'edgecolor', 'none'); alpha(h, 0.5); X, Y, and Z are each 2x2 matric...

3 years ago | 0

| accepted

Answered
Which standard MATLAB functions do you shadow with your own version, and why?
I shadow *bsxfun* with my own version, which calls the builtin function bsxfun for all inputs except symbolic ones, for which I ...

4 years ago | 0

Answered
Which standard MATLAB functions do you shadow with your own version, and why?
I shadow *dot* and *cross* with my own versions, which extend the standard functionality to allow for inputs which have <https:/...

4 years ago | 0

Question


Which standard MATLAB functions do you shadow with your own version, and why?
When you have two functions on your MATLAB path with the same name, the function in the directory higher up the path gets called...

4 years ago | 9 answers | 0

9

answers

Answered
How do *you* debug mex files on Mac OS
<https://www.mathworks.com/matlabcentral/answers/249023-debugging-c-mex-files-in-xcode-7-on-el-capitan#answer_197054 This> is ho...

5 years ago | 0

Answered
Debugging C++ mex files in Xcode 7 on El Capitan
I have been able to hit a breakpoint in my mex code, within the Xcode IDE, by doing the following steps: # <https://www.mathw...

5 years ago | 0

Answered
Debugging C++ mex files in Xcode 7 on El Capitan
I build the mex file as a command line project in Xcode, using the following custom build settings: <</matlabcentral/answers/...

5 years ago | 0

Answered
Which MATLAB operations/functions need speeding up?
MATLAB has no documented functions for reading JSON files, and the internal, undocumented method: matlab.internal.webservic...

5 years ago | 0

Answered
How to compute the hash of a string using SHA algorithms
The Java-based solution can be found <http://uk.mathworks.com/matlabcentral/answers/45323-how-to-calculate-hash-sum-of-a-string-...

5 years ago | 1

Answered
How to calculate hash sum of a string (using java)?
A similar solution: %STRING2HASH Convert a string to a 64 char hex hash string (256 bit hash) % % hash = string2has...

5 years ago | 0

Question


How can I access an API which requires OAuth 2.0 authorization, such as Google APIs
Some REST APIs, such as <https://developers.google.com/analytics/devguides/reporting/core/v3/gdataAuthorization Google Analytics...

5 years ago | 2 answers | 0

2

answers

Answered
Returning and passing void pointers to mex functions
Whilst you are not interfacing to a C++ class, much of a similar discussion on how to reuse a pointer to a C++ class is relevant...

6 years ago | 1

Answered
How to prevent Matlab from GPU switching on Macbook Pro?
If you don't need the desktop, then you can run the command window only version of MATLAB by calling the following in a terminal...

6 years ago | 0

Answered
Which MATLAB operations/functions need speeding up?
Matrix operations involving the transpose of a sparse matrix, especially J' * J and J' * K, where J is a very tall matrix. Const...

6 years ago | 0

Answered
Are the values in each compressed column of a sparse matrix stored in order?
Since it is possible to write the column data in any order from a mex file, I would say *no*. However, I tried three methods ...

6 years ago | 0

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...

6 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...

6 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...

6 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.

6 years ago | 0

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...

6 years ago | 0

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...

6 years ago | 3 answers | 1

3

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...

6 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...

6 years ago | 0

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