Groovy programming in MATLAB

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Malcolm Lidierth 2012-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/42463-groovy-programming-in-matlab

Groovy ( http://groovy.codehaus.org/ ) is a modern JVM-based programming language that can be used easily within MATLAB if you add groovy-all.jar to the MATLAB javaclasspath.

As a Python-like, dynamically-typed language, it’s likely to be attractive to the some MATLAB users. http://groovy.codehaus.org/Cookbook+Examples has examples of using Groovy with databases, XML, URLs and more.

Groovy “closures” can be assigned to MATLAB variables and work much as MATLAB anonymous functions. You can also explore Groovy on-the-fly by invoking a groovy console session in MATLAB (works on Windows and from R2012a on Mac/Linux):

>> console=groovy.ui.Console();
>> console.run();

A search for “groovy” on Answers and the Newsgroup gives no hits – hence this “question” to draw more attention to it.

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Malcolm Lidierth 2012-7-1

在 MATLAB Online 中打开

@Walter

In short, I do not know because I have not tested that. Groovy's dynamic features mean that it is generally slower that Java - using reflection etc much as MATLAB does for Java use. I have used it only to write a static library to interface to a Java API. That static library is called from MATLAB/R/Scilab etc.

As it produces Java byte code, MATLAB is always going to beat it in performance when the object methods are computationally intensive. Horses-for-courses: for matrix algebra use MATLAB.

But take the following snippet from the innards of a switch block which looks very MATLAB-like:

            for (obj in props) {
              switch (obj.key) {
  ...
                  case 'Alpha':
                  case 'EdgeColor':
                  case 'LineColor':
                  case 'XData':
                  case 'YData':
                  case 'ZData':
                      plot.("set" + obj.key)(props.(obj.key))
                      break
  ...

Here plot is a Java object which has methods such as setAlpha. props is a LinkedHashMap and its key set is being looped over. if map.key contains "Alpha" we call setAlpha using the value for that key form the map.

I think MATLAB programmers will find that this code looks pretty familiar. Java programmers would have needed to do a lot of tedious getClass()/getMethod() calls and probably included half-a-dozen try/catch blocks. Groovy does all that behind the scenes.

There are drawbacks - fewer compile time errors with Groovy than Java (so more chance of a run-time error) and they seem to have thrown out the Java good-practice handbook: properties and methods public by default for example. Also the IDEs are not all up-to-speed on it (IntelliJ seems best at present).

Malcolm Lidierth 2012-7-3

@Yair - no problem.

Kye Taylor 2012-7-3

With a name like groovy, I feel compelled to learn it.

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Answer 1

Yair Altman 2012-7-4

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https://ww2.mathworks.cn/matlabcentral/answers/42463-groovy-programming-in-matlab#answer_52579

For anyone's information, I just posted the following article by Malcolm about using Groovy in Matlab: http://UndocumentedMatlab.com/blog/using-groovy-in-matlab/