#Matlab 2009 open variables code
#Matlab 2009 open variables series
#Matlab 2009 open variables windows

This is a critical requirement for using a parfor-loop. The parfor-loop is designed for task-parallel types of problems where each iteration of the loop is independent of each other iteration. Note : The 'size' option was new in R2008b. Matlabpool open 2 end Starting matlabpool using the 'local' configuration. If matlabpool( 'size') = 0 % checking to see if my pool is already open my workers will be running on the dual-core laptop machine where my Matlabpool using my default local configuration (i.e. This concept will become important when understanding why particular constraints are placed on the use of parfor.Р”В«efore looking at some examples, I will open up a matlabpool so I can run my loops in parallel. When MATLAB gets to the parfor-loop, it statically analyzes the body of the parfor-loop and determines what information goes to which worker and what variables will be returning to the client MATLAB. The cool thing about parfor is this data transfer is handled for the user. So, the data needed to do these calculations is sent from the client to workers,Р”Р„nd the results are sent back to the client and pieced together. However, when using a parfor-loop the iterations are run not on the client MATLAB machine but are run in parallel on MATLAB workers.Р”В®ach worker has its own unique workspace.

#Matlab 2009 open variables series

In a parfor-loop (just like in a standard for-loop) a series of statements known as the loop body are iterated over a range of values. I have separated theseР”В®xamples into four encompassing categories: I decided to show a few examples highlighting the main challenges that one might encounter.

#Matlab 2009 open variables code

However, in other cases you may need to slightly alter the code so that parfor can work. In some cases, you may only need to change a for-loop to a parfor-loop to get their code running in parallel. Toolbox to the Parallel Computing Toolbox. Note for clarity : Since Loren's introductory post, the toolbox used for parallel computing has changed names from the Distributed Computing There are also some nice introductory videos. Loren has a very nice introduction to using parfor in one of her previous posts. I will assume that the reader has a basic knowledge of the Performance will not be addressed in this post. This post will focus on getting a parallel code using parfor up and running.

The more commonly used functions in these tools: the parfor-loop. Each variable has its own tab, and you can also split the window (like the m-file editor) to view multiple variables at the same time (as I show in the screenshot above).I wanted to write a post to help users better understand our parallel computing tools. I find the Variables window handy when IРІР‚в„ўm debugging and I want to follow the changes of multiple variables.

You can insert or delete rows or columns while preserving the rest of the data.

You want to monitor the value of an array element while debugging code.

You want to read the elements of an array that has too many dimensions to conveniently read in the console.

You want to read the elements of an array that is too big to conveniently read in the console.

There is nothing unique to its functionality, since there are functions that can do all of the same tasks, but it can be more convenient. Now you can read (and modify!) the elements interactively. If you double click on a variable name, then the Variables window opens for that variable. The workspace lists the names of the variables stored in memory.

#Matlab 2009 open variables windows

If you have the MATLAB desktop open, one of the default windows is the Workspace. Ok, so what is the Variables window, anyway? The Variables window gives you a simple spreadsheet to view and edit variables.

A short survey (i.e., 2 people) showed me that this arguably fundamental feature was completely unknown in a lab where just about everyone was using MATLAB. I mentioned the Variables window in passing and I was stopped to explain what it was. Later, I was describing the conversation to a colleague, who was a fellow PhD student and another frequent MATLABer. I assumed that this was because they were new to MATLAB. The student thought it was very useful but they were surprised because they had never seen the window before. I never would have talked about it until after one workshop there was a student asking a question and I opened the Variables window to help. IРІР‚в„ўm guilty of giving introductory workshops without mentioning the Variables Window.

Did you know that MATLAB has a Variables Window? It does, though the documentation does an excellent job of not saying much about it (searching within the documentation got me nothing but a search engine got me to this helpful page).