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Undocumented profiler options
The Matlab profiler is a powerful tool for debugging performance-related issues in Matlab applications. However, it also has some undocumented options that facilitate other forms of debugging, namely...
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JIDE Property Grids
I would like to welcome guest blogger Levente Hunyadi.Matlab’s property inspectorWe often wish to edit properties of heterogeneous objects using a common interface. Matlab’s property inspector, invoked...
View ArticleMatlab-Java memory leaks, performance
There are several ways of retrieving information from a Java object into Matlab. On the face of it, all these methods look similar. But it turns out that there are important differences between them in...
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Matlab mex in-place editing
I would like to welcome Matlab Mex power-user Peter Li to a first in a short series of articles about undocumented aspects of Mex programingEditing Matlab arrays in-place can be an important technique...
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Profiling Matlab memory usage
Anyone who has had experience with real-life applications knows that Memory usage can have a significant impact on the application’s usability, in aspects such as performance, interactivity, and even...
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Matlab’s internal memory representation
Once again I’d like to welcome guest blogger Peter Li. Peter wrote about Matlab Mex in-place editing last month. Today, Peter pokes around in Matlab’s internal memory representation to the greater good...
View ArticlePreallocation performance
Array preallocation is a standard and quite well-known technique for improving Matlab loop run-time performance. Today’s article will show that there is more than meets the eye for even such a simple...
View ArticleArray resizing performance
As I have explained last week, the best way to avoid the performance penalties associated with dynamic array resizing (typically, growth) in Matlab is to pre-allocate the array to its expected final...
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Internal Matlab memory optimizations
Yesterday I attended a seminar on developing trading strategies using Matlab. This is of interest to me because of my IB-Matlab product, and since many of my clients are traders in the financial...
View ArticleThe Java import directive
A recent blog post on a site I came across showed me that some users who are using Java in Matlab take the unnecessary precaution of always using the fully-qualified class-name (FQCN) of the Java...
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Allocation performance take 2
Last week, Mike Croucher posted a very interesting article on the fact that cumprod can be used to generate a vector of powers much more quickly than the built-in .^ operator. Trying to improve on...
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Assessing Java object size in Matlab
Have you noticed that all Java object references are displayed as using 0 bytes in the Matlab Workspace browser and the whos function? This is not a bug, but in fact a deliberate design decision, in...
View ArticleQuirks with parfor vs. for
A few months ago, I discussed several tips regarding Matlab’s parfor command, which is used by the Parallel Computing Toolbox (PCT) for parallelizing loops. Today I wish to extend that post with some...
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