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**Content Feed**

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 ...

11 months 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 ...

1 year ago | 0 answers | 2

### 0

answersMatlab 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...

1 year 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

answersHow 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

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

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 | 8 answers | 0

### 8

answersWhich 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

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

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...

4 years ago | 0

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...

4 years ago | 0

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/...

4 years ago | 0

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

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

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

answersReturning 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...

5 years ago | 1

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...

5 years ago | 0

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...

5 years ago | 0

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 ...

5 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...

5 years ago | 1 answer | 0

### 1

answerQuestion

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

answersQuestion

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

answersimagesc() 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

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 | 2 answers | 1

### 2

answersWhich 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

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

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...

6 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...

6 years ago | 3 answers | 0