aptosid nvidia driver problem with kernel 3.7.0+

http://forums.opensuse.org/english/get-technical-help-here/pre-release-beta/481597-warning-kernel-3-7-1-1-breaks-fglrx-12-6-legacy-driver.html

fix a problem with nvidia driver for kernel 3.7.0+

debian experimental repo

In particular, install a package 

apt-get update

apt-get -t experimental install packagename 

see http://wiki.debian.org/DebianExperimental

apple extra menu bar

/System/Library/CoreServices/Menu Extras

command + drag to move or delete 

quick proxy for chrome

https://chrome.google.com/webstore/detail/quick-proxy/gchhimlnjdafdlkojbffdkogjhhkdepf

ssh -D 

proxytype: sock5

centos sudo

http://www.tuxradar.com/answers/635

/etc/sudoers 

$user ALL=(ALL) ALL 

display file with line number

http://www.commandlinefu.com/commands/view/2085/display-a-file-with-line-number

nl file > more 

or less -N,

the former is better since all are in the console windows

macvim font setting

:set guifont=*
This brought up my native font selector

and I got back the value of "guifont=Menlo Regular:h14″. 
To set this style in my .gvimrc file:

set guifont=Menlo\ Regular:h14"

r profile.site change options permanently

It seems the following link points to an approach, however, it does not work well. 

http://cran.r-project.org/doc/manuals/R-intro.html#Customizing-the-environment

So at least this file can be changed for this purpose, 

library/base/R/Rprofile 

a couple tips for mac

terminal color

http://osxdaily.com/2012/02/21/add-color-to-the-terminal-in-mac-os-x/

export CLICOLOR=1
export LSCOLORS=GxFxCxDxBxegedabagaced

install wget

./configure --with-ssl=openssl 

make 

sudo make install 

short cuts

http://support.apple.com/kb/HT1343

in particular: ctrl E and ctrl A might be helpful sometimes

configure windows 7 to support dnsmasq

Configure Windows 7 to resolve hostnames (source)

1. Go into Network Connections (I just typed "Network Connections" om the start icon -> run box)
2. Right click on your Network Adapter and go into Properties
3. Select "Internet Protocol Version 4 (TCP/IPv4)"
4. Under the General Tab click Advanced
5. Under the DNS Tab select the radio button that says "Append these DNS suffixes (in order)"
6. Click "Add…"
7. Enter a single period in the text box and click "Add."
8. Click OK in the "Advanced TCP/IP Settings" Dialog
9. Click OK in the "Local Area Connection Properties" Dialog

And there you go.

copied from http://blog.edwards-research.com/2009/09/lan-dns-resolution-with-wrt54g-dd-wrts-dsnmasq-linux-and-windows-7/

Stop Mac from sleeping

pmset noidle

google code wiki syntax

http://code.google.com/p/support/wiki/WikiSyntax

plus, 

preview http://fossil.wanderinghorse.net/demos/wikiwym/GoCoWi-previewer.html

git rewriting history

see 6.4 Git Tools - Rewriting History

http://git-scm.com/book/en/Git-Tools-Rewriting-History

convolution theorem

convolution theorem:

For any two vectors a and b of length n, w here n is a power of 2, 

where the vectors a and b are padded with 0s to length 2n and  \cdot denotes the com-
ponentwise product of two 2n-element vectors.

copied from introduction to algorithm 

http://en.wikipedia.org/wiki/Convolution_theorem

make automatic variables

http://www.gnu.org/software/make/manual/make.html#Automatic-Variables

take a look at the code of a s4 method

getMethod('sampling', signature='s4class')

linux search manual

apropos 

for example

# apropos open 

ap·ro·pos

 prep \ˌa-prə-ˈpō, ˈa-prə-ˌ\

trace files accessed

using strace on linux 

what is fs_usage on mac?

git status -uno

  git status -uno

R machine related limits & numbers

?.Machines 

sample.int(.Machine$integer.max, 1)

R's memory limits

?"Memory-limits"

windows 7 chinese characters

when file name in chinese is not squares, delete c:\windows\system32\fontcache.dat 

R cxxflags

http://www.mail-archive.com/r-devel@r-project.org/msg08059.html

support chinese fonts on debian

http://en.wikipedia.org/wiki/Help:Multilingual_support_(East_Asian)

Simply put, two packages:

ttf-arphic-uming ttf-wqy-zenhei

git diff for files in different branches

git diff master:main.c branch1:main.c

xfce application shortcuts

it turns our now <Primary> is the control key. :)

and <Super> is the windows key

program library howto

http://www.dwheeler.com/program-library/

dso how to

http://www.akkadia.org/drepper/dsohowto.pdf

.a to .so

ar -x mylib.a  gcc -shared *.o -o mylib.so

LMDE 12 disable beep

and the following to /etc/modeprob.d/blacklist.conf

blacklist pcspkr

 

add the following to alsa-base.conf

options snd_hda_intel beep_mode=0

not sure which one do the trick, but who cares?

vim set path to find more included file

see 

http://stackoverflow.com/questions/1932604/vim-problem-with-gf-command

let vim be more powerful for editing c/c++ code

list 2 env in R

list2env {base}

R Documentation

From A List, Build or Add To an Environment

Description

From a named list x, create an environment containing all list components as objects, or "multi-assign" from x into a pre-existing environment.

c++filt - Demangle C++ and Java symbols.

c++filt <symbol>

Example:

c++filt -n _Z1fv

 -n

       --no-strip-underscores

           Do not remove the initial underscore.

a couple of git branch cmds

1. create a new branch from origin's branch

git checkout -b serverfix origin/serverfix

2. get everything from origin

git fetch origin 

3. deleting remote branch

git push origin :serverfix

Note that the syntax for git push is

git push [remote name] [local branch]:[remote branch]

source:

http://git-scm.com/book/en/Git-Branching-Remote-Branches

using the default constructor

From page 460 of C++ Primer (4th ed)

A common mistake among programmers new to c++ is 

to declare an object initialized with the default constructor

as follows

// oops! declares a function, not an object

Sales_item myobj();

The problem is that our definition of myobj is interpreted as

a declaration of a function taking no parameters and returning 

an object of type Sales_item --- hardly we intended.  The correct

way to define an object using the default ctor is to leave off the 

trailing, empty parentheses. 

// ok: defines a class ojbect ...

Sales_item myobj;

On the other hand, this code is fine:

// ok, create an unnamed, empty sales_item and use to initialize myobj

Sales_item myobj = Sales_item();

Here we create and value-initialize a Sales_item object and to use 

it to initialize myobj.  The compiler value-initializes a Sales_item by running

its default ctor. 

add date/time stamp to jpg

convert DSC00497.JPG -font Arial -pointsize 72 -fill white -annotate +100+100  %[exif:DateTimeOriginal] output.jpg

http://www.imagemagick.org/script/index.php

vim tips

go the last non-whitespace on current line: g_

go the file from which gf is used: bf, ctrl + 6, ctrl + ^

build boost

http://www.boost.org/doc/libs/1_49_0/more/getting_started/unix-variants.html#easy-build-and-install

unix env for ld and execution

use environment variable:

ld_library_path

and 

ld_run_path

if not adding the path to ld.so.conf.d 

create variables in a created environment inside global environment inside a function

# create an environment inside the global 
# environment and create variables inside
# that environment 

# ref: http://goo.gl/GCQhZ
foofun <- function() {
   assign("env1", new.env(parent = globalenv()),  envir = globalenv()) 

   # this would not work 
   # env1 <- new.env(parent = globalenv());
   assign("tmpv", "tmpv", envir = globalenv()$env1) 
} 

foofun() 

ls() 

ls(envir = globalenv()$env1) 

rm("env1", envir = globalenv()) 
ls() 

#

lme4 nested example

http://lme4.r-forge.r-project.org/book/
chapter 2, we have example of nested factors

cask is nested in batch

so
strength ~ 1 + (1 | cask) + (1 | batch)
is problematic,

the correct one is
strength ~ 1 + (1 | cask) + (1 | batch:cask)
though
it is equivalent to
strength ~ 1 + (1 | batch / cask).

symbolic description of factorial models for analysis of variance

Symbolic Description of Factorial Models for Analysis of Variance

G. N. Wilkinson and C. E. Rogers

http://www.jstor.org/stable/2346786

Y_ij = m + a_i + b_j + (ab)_ij

A + B + A : B

Y_ij = m + a_i + (ab)_ij

A + A : B

---

A * B = A + B + A : B

A / B = A + A : B

blocks / plots 

nitrate * density 

sftp by shell script

though sftp is not used nowadays, it is still needed, 

copied from somewhere cannot quite remember

#! /bin/sh

ftp -n ftp.ftp.com <<_FTPEND

quote USER anonymous

quote PASS aa 

bin

cd incoming

put file.tar 

quit

_FTPEND

R code to fit varying intercepts with nested structure linear model

## sim some data and fit an varying intercept model
##

a <- 1:3
b <- 1:4

intercepts <- rnorm(12) 
intnames <- outer(a, b, FUN = function(x, y) { paste(x, y, sep = ':')} )
names(intercepts) <- as.vector(t(intnames)) 

N <- 10000; 
x <- round(abs(rnorm(N)) * 10, 2)
noise <- rnorm(N); 
ai <- sample(a, N, replace = TRUE) 
bi <- sample(b, N, replace = TRUE) 
beta <- 4; 
y <- intercepts[ai * 4 + bi - 4] + x * beta + noise 

ai <- as.factor(ai)
bi <- as.factor(bi)
table(ai:bi) 
print(intercepts) 
# varying intercepts model specification
fita <- lm(y ~ -1 + ai : bi + x) 
# in R lm and lmer's model specification, A * B = A + B + A : B
# where A : B is the interaction of A and B. So in the above,
# ai : bi is used to specify varying intercepts and -1 to
# get rid of the global intercept. 

short name for host under ssh

ssh config:

http://www.openbsd.org/cgi-bin/man.cgi?query=ssh_config&sektion=5

for example, file ~/.ssh/config, we have 

Host  google 

Hostname www.google.com

R draw ellipse

 1
 2 N <- 100;
 3 x <- numeric(N);
 4 y <- numeric(N);
 5 x[1] <- -100;
 6 y[1] <- -100;
 7 for (i in 2:N) {
 8   x[i] <- rnorm(1, 2 + (y[i - 1] - 3) / 6, sqrt(115 / 3))
 9   y[i] <- rnorm(1, 3 + (x[i] - 2) / 4, sqrt(115 / 2))
10 }
11 library(mixtools)
12 plot(y ~ x);
13 mu <- c(2, 3);
14 Sigma <- matrix(c(40, 10, 10, 60), ncol = 2)
15 ellipse(mu, Sigma);
16 

detailed explanation of interp.lin in bugs/jags

Essentially, vector x and y define a line connects all the dots [dot i
is (x_i, y_i)].  The function give the y-coordinate for any x-coordinate given
by argument e. 

matrix to vector by row of by col in R

m <- matrix(....) 

as.vector(m)   # by column 

as.vector(t(m)) # by row 

Grep Recursively Through Single File Extension

grep --include=*.py -lir "delete" .

from http://www.commandlinefu.com/commands/view/9046/grep-recursively-through-single-file-extension

grep tab

After some searching I found out the answer is to not use \t but to use Ctrl-v and then the <tab> key to put the tab character directly in the command. Odd. So it looks like:

 grep -R "   $" *

where the tab character is inserted as Ctrl-v and then Tab.

copied from http://mandrivausers.org/index.php?/topic/34048-grepping-for-tabs/

See Where a Package is Installed on Ubuntu

copied from

http://www.howtogeek.com/howto/ubuntu/see-where-a-package-is-installed-on-ubuntu/

 

See Where a Package is Installed on Ubuntu

Once you use the apt-get utility to install a package, sometimes it seems to disappear into nowhere. You know it's installed, you just have no idea where.

If you know the name of the executable, you can use the which command to find the location of the binary, but that doesn't give you information on where the supporting files might be located.

There's an easy way to see the locations of all the files installed as part of the package, using the dpkg utility.

dpkg -L <packagename>

use gs to reduce pdf size somehow

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/default -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf a.pdf

from http://www.ubuntugeek.com/ubuntu-tiphowto-reduce-adobe-acrobat-file-size-from-command-line.html