Yair Altman

Consultant

Last seen: Today | Active since 2007

Website: http://UndocumentedMatlab.com
LinkedIn: http://www.linkedin.com/in/yairaltman

Author of "Accelerating MATLAB Performance" book:
http://UndocumentedMatlab.com/books/matlab-performance

Author of "Undocumented Secrets of MATLAB-Java Programming" book:
http://UndocumentedMatlab.com/books/matlab-java

MSc Computer Science, BSc Physics (both with top honors)

Professional programmer and manager since 1991

Contact me: altmany at gmail.com

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Answered
how to find brushed data
In the new graphics system (R2014b onward), the brushed data info can be extracted from the hidden/undocumented BrushHandles pro...

2 giorni ago | 1

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Submitted

export_fig
Publication-quality export of Matlab figures and axes to various vector & bitmap formats

14 giorni ago | 1332 downloads |

Answered
Exporting images (png) through export_fig - painfully slow
Try to either reduce the resolution (the -r450 part), or to save as a vector-graphics image (PDF/EPS) rather than a PNG bitmap.

28 giorni ago | 0

Answered
How to save very large image to original resolution
Try to use export_fig's sister image-export utility, ScreenCapture: https://www.mathworks.com/matlabcentral/fileexchange/24323-s...

circa 2 mesi ago | 0

Submitted

findjobj - find java handles of Matlab graphic objects
Find java objects contained within a specified java container or Matlab GUI handle

2 mesi ago | 61 downloads |

Submitted

ScreenCapture - screenshot of component, figure or screen
ScreenCapture gets a screen-capture image of any Matlab GUI handle, or specified screen area rectangle

3 mesi ago | 65 downloads |

Submitted

IQML - Matlab connector to IQFeed
Matlab connector to IQFeed optimized for reliability, ease-of-use, functionality and performance (including parallelization)

3 mesi ago | 4 downloads |

Submitted

cprintf - display formatted colored text in Command Window
Displays sprintf-formatted strings in the Command Window using the specified color/underline style

6 mesi ago | 147 downloads |

Submitted

checkClass - inspect a Java/Matlab/COM class object/name
inspect a Java/MCOS/COM/.NET object or classname and display its methods, properties, events, interfaces, etc.

7 mesi ago | 1 download |

Answered
Can I somehow improve performance of str2double?
I use the following function to convert a cell-array of strings to a cell-array of numeric values (where applicable) - it is ~2-...

8 mesi ago | 2

Answered
Speed issues with Matlab code compiled using SDK compiler for Python
Perhaps your deployed environment is different from your Matlab &D one. For example, perhaps you can access a GPU on the R&D env...

9 mesi ago | 0

Answered
How To Clear Java Heap Space Memory????
Clearing Matlab's Java heap space has been long awaited, but I'm afraid that the suggested submission (Davide Tabarelli's JavaHe...

10 mesi ago | 2

Answered
Import data tool speed
The import tool GUI only shows you a preview of the data, based on the top N lines in the file, it does not read and process the...

10 mesi ago | 0

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Submitted

setFigDockGroup
Sets a figure's docking group container

10 mesi ago | 8 downloads |

Answered
MATLAB Profiler - Granularity of Information
Use the [undocumented] -detail builtin profiler option, as in: profile on -detail builtin This works on old Matlab releases as ...

circa un anno ago | 1

| accepted

Answered
How can I make the plot transparent in a gscattter?
Nice answer Adam, but not exactly accurate if you are willing to use some undocumented features... The underlying objects in a...

circa un anno ago | 3

Answered
MATLAB export_fig crops title
This is fixed in the latest version of export_fig (3.09). In the future, report such issues in export_fig's issues page: https:/...

circa un anno ago | 0

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Answered
How to speed up a code from the Code Profiler Results ?
Try to set the "Vectorized" property using the odeset function, before running ode45. Also, specifying the Jacobian in advance (...

oltre un anno ago | 0

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Answered
[Soft question] Tips and tools to analyze unfamiliar OO code
For inspecting a single object or class, try the GUI-based uiinspect utility (https://www.mathworks.com/matlabcentral/fileexch...

oltre un anno ago | 0

Answered
Heatmap Axis Labels Printing Vertically?
The heatmap's X labels orientation is dynamically determined based on the number of labels and the axes width. In other words, i...

oltre un anno ago | 1

Submitted

popupPanel Displays a popup panel with specified content
popupPanel Displays a popup panel with specified file contents, help topic, HTML or webpage

oltre un anno ago | 1 download |

Answered
graphics performance 2019a vs 2016b
R2019a uses the integrated axes toolbar, which constantly monitors mouse movements in order to generate data tips on-the-fly. If...

oltre un anno ago | 0

| accepted

Answered
Poor performance of mex file
You m-function uses parallelization (parfor), while your mex file does not. This in itself could cause your m-code to run much f...

oltre un anno ago | 0

Answered
Increase CPU Speed - MAC
You can separate the problem into separate tasks and launch separate Matlab processes to process them in parallel. This is essen...

oltre un anno ago | 0

Answered
How can I clear stuck help popups?
Updates June 12, 2020: There is a recognized bug report on a very similar issue: https://www.mathworks.com/support/bugreports/1...

oltre un anno ago | 5

| accepted

Answered
dynamic java path vs static java path
Some Java functionality, especially those that are concerned with Java events that need to propagate to Matlab callbacks, does n...

oltre un anno ago | 0

Answered
Matlab in AVX2 mode (for AMD CPU's)
This is apparently fixed on R2020a as reported by @NedFlanders (original credit is apparently due to @MichelKatz): https://www...

oltre un anno ago | 0

| accepted

Answered
How to change Heatmap's Grid (Edge) appereance and behavior?
There are several alternatives: Update the grid style to a non-solid line, for example: hHeatmap = struct(h_map).Heatmap; hHe...

oltre un anno ago | 3

| accepted

Answered
Unable to use Java class in a package - Undefined function or variable 'CartesianCoordinate'.
This problem could be due to numerous possible causes, and unfortunately Matlab is not very helpful in explaining the root cause...

oltre un anno ago | 0

Answered
How to load multiple excel files with multiple excel sheets and store it in matlab faster?
Try to use the 'basic' mode of xlsread, which reads the XLS file directly instead of using the much slower Excel instance: for ...

oltre un anno ago | 0