Are there cases when using global variables is the most efficient implementation?
I hate using the global workspace, but I end up doing it all the time. There is only one reason that I have had for doing this: performance/efficiency.
I am well aware of how JIT acceleration works, and how Matlabs in-place operations works. The functions setappdata/getappdata seem to be good candidates for replacing the use of global workspace, however consider a situation where you modify the data in the calling function. If, as are the cases in the two FEX submissions described above, I call functions often and and share large amounts of data, isnt the global workspace more efficient than other solutions?
The answer to this question in Matlab before 2007 I would say definetly yes: the global workspace is the fast, but ugly way. I dont feel to old to learn new tricks, so please enlighten me here, and the next code i make will be free of globals.
Note that milliseconds count.