ANOVA and Tukey HSD in MATLAB

To perform ANOVA followed up by Tukey HSD in MATLAB do the following.

1. Create a table where each column represents a different system and each row represents a different domain (data source upon which the evaluations are performed).
2. Save this file in csv and import it into MATLAB using the data import wizard or dlmread function.
3. Now call one way ANOVA as follows.
   [p,t,st] = anova1(dataMatrix)
4. Now run Tukey HSD using st as follows,
   [c,m,h,nms] = multcompare(st)

TexShop

In TexShop to autocomplete a bibliography reference or a label just type some part of the reference and press F5 to get a list of candidates.

Multiprocessing

In Python GIL (Global Interpreter Lock) prevents from running more than one thread at a time in a process. If you use Jython or IronPython this limitation is not there. But with CPython it is there. Use the multiprocess module (from Python version 2.6 afterwards) to overcome this limitation and have truly multiprocessing capabilities. If you encounter an error during execution and if your processes become zombies then you could either close the terminal (which will kill the zombies as well), or more elegantly use kill -9 on the "parent process id (PPID" of those zombies. To find the process ids use "ps -epw" command. You can also kill a process within the top window by typing "k" and then entering the corresponding process id.

multiprocessing module has similar API as in threading module. It works on Windows, Linux and OS/X.
The following code shows how to create and start several processes.

from multiprocessing import Process
import os

def info(title):
    print title
    print 'module name:', __name__
    print 'parent process:', os.getppid()
    print 'process id:', os.getpid()

def f(name):
    info('function f')
    print 'hello', name
    c = 0
    for i in range(1,100000):
        for j in range(1, 100000):
            if i == j:
                c += 1
    pass
    

    
if __name__ == "__main__":
    info('main line')
    p = Process(target=f, args=('bob',))
    q = Process(target=f, args=('sam',))
    r = Process(target=f, args=('dan',))
    s = Process(target=f, args=('david',))
    q.start()
    p.start()
    r.start()
    s.start()
    p.join()
    q.join()
    r.join()
    s.join()
    pass

Mapping keys in Mac

If you want to set things like HOME, END, Japanese RO key to backslash, etc. on MacBook Pro (with the built-in key board or an external Windows keyboard) then use the following software.

KeyReMap4MacBook.

For example, to remap the Underscore(Ro) key to backslash
For Japanese --> Change Underscore(Ro) Key --> Underscore(Ro) to Backslash(\)

Invalid annotation object error in PDFs

If you used Adobe acrobat to annotate a PDF file and you had Acrobat crashed or had to restart the computer abruptly during the annotation process then you might experience this problem when you reopen the PDF file from Acrobat. Of course if you use Skim or Preview to open the file then you will not get this popup window and everything will display without a problem. To solve this problem first open the PDF under consideration in Preview and then do a save as for the file. You can give the same file name and replace the file. Now everything will work fine.

Gnuplot

The following set of commands will plot two data series in a file using point markers and also write the output to a eps file and further convert it to pdf. You can write these commands into a text file and run gnuplot ($ gnuplot fname) on that file.
set datafile separator ","

set xlabel "value"

set ylabel "probability"

plot "dist.csv" using 1:2
#plot "1000_100_uniform.csv" using 1:1 title "Lin",  "1000_100_uniform.csv" using 1:2 title "Cosine" with points


set terminal postscript eps enhanced color solid rounded
set output "plot.eps"
!epstopdf plot.eps
replot
show output
pause -1

Mac Tricks

Mac Tricks: "This post summarizes some useful tips on mac.

1. quick silver.
    start an application.
   option+space.

2. Command+S can save files in almost any application.

3. Command+Option+ESC will bring the force kill box.

4. When Apple Mail hangs with GMail Recovered Mail
     This can happen when you send large messages and something goes wrong.
     The solution is described here
     Delete the hidden directory,    

    ~/Library/Mail/IMAP-@domain.tld@imap.domain.tld/.OfflineCache

    and then delete the Recovered Messages mail folder in Mail.app

    

"

(Via Danushkas Research Blog.)