MATHWORKS MATLAB R2011A PORTABLE MAC OS X
MATHWORKS MATLAB R2011A PORTABLE CODE

I timed flibbergibble for various values of n using MATLAB R2010b. To the sum of the integers from 1 to n, which is n*(n+1)/2.īottom line: memory copying during the assignment statement causes the time required to execute the loop to be proportional The time required to execute the entire loop is therefore proportional Time required to copy k elements is proportional to k.

See the pattern? On the k-th time through the loop, MATLAB has to make a copy of k elements into newly allocated memory.

So MATLAB allocates enough new memory for three elements and then copies y(1) and y(2) and assigns y(3) into the new space. The third time through the loop assigns to y(3), which doesn't exist yet. So MATLAB allocates enough new memory for two elements and then copies y(1) and assigns y(2) into the new space. The second time through the loop assigns to y(2), which doesn't exist yet. The first time through the loop, the variable y hasn't been assigned to yet, so MATLAB creates it through the assignment to y(1). 'That's more than 400 times faster! Why is foobar so slow in a function?'Įxperienced MATLAB users know that the performance problem has little to do with foobar(k) on line 4 of the profile report and much to do with y(k) = on the same line. 'You can see that foobar takes about 0.35 ms per call (70.93 / 200000), but when I call foobar 200000 times from the command line in a loop it only takes 8.5e-7 seconds per call: 'Well, I ran the profiler on my function flibbergibble, which calls foobar: The tech support engineer will start digging into the question to see why the unhappy MATLAB user has reached his conclusion:

'Why does the function foobar run so much faster at the command line than when I put it in a function?'.

'Why does MATLAB hang if I put a call to foobar in a loop?'.

'Why is the MATLAB function foobar so slow?'.

It’s a pretty unique social computing experience, and I recommend that everyone try it out at least once. The contest is a great way to show your MATLAB chops, and to learn new tricks and techniques. The new contest starts this Wednesday, April 13. Be sure to check back on this blog in the next few weeks for an in-depth review. Also Community Members with more than 1500 reputation points can edit questions, answers, and tags. We’ve added a bunch of cool new features, including a categorical navigation/search on the left side of the screen. MATLAB Answers has come a long way since it was first released. We’ve made the custom keyboard easier to use, added snapshot previews to the Command Window, and reorganized the History to be filterable and easier to understand. This version has a lot UI and performance improvements. We were lucky that we were able to release the latest version of MATLAB Mobile at the same time as new desktop MATLAB. You can also now merge differences in MAT files. With the Comparison tool you can now compare individual variables in a MAT-file down to the field or element of arrays and structures. To use it, just go to the Help menu and select “Submit a MathWorks Support Request.” You’ll need your MathWorks Account credentials handy in order to log in. It’ll get to the developers faster than by leaving a comment on this blog. This is also a great way to ask for all the enhancement you want. You can now use a built-in GUI for submitting support requests instead of using the website. Submit a Tech Support Request from MATLAB The plot catalog has been redesigned to be more usable, include more plot types, and provide diagnostics. Previously we started highlighting non-local variables used across functions now, we’ve extended this to cover global and persistent variables as well. Over the next few months I’ll be posting more about how this API works and give examples of a lot of cool things you can do now.

MATHWORKS MATLAB R2011A PORTABLE MAC OS X

MATLAB now behaves more like other native applications on Mac OS X by showing its menus at the top of the screen instead of inside the application frame.Īs I long ago promised, we now provide an official programmatic way to access the MATLAB Editor, and its contents.

MATHWORKS MATLAB R2011A PORTABLE CODE

Sadly for me, this is also the last release of (desktop) MATLAB that has new code I actually wrote. At the same time we also released MATLAB Mobile 1.3, and there are a few new and improved things in the community to talk about as well. There are a lot of new and improved features in this release. Last Friday we released MATLAB 7.12 (R2011a), the latest and greatest in MATLAB.

Mathworks matlab r2011a portable