xtable in knitr

Here i am going to give an example of xtable package in knitr. We use cars data which comes default through the R
The summary data of cars:

summary(cars)

##      speed           dist    
##  Min.   : 4.0   Min.   :  2  
##  1st Qu.:12.0   1st Qu.: 26  
##  Median :15.0   Median : 36  
##  Mean   :15.4   Mean   : 43  
##  3rd Qu.:19.0   3rd Qu.: 56  
##  Max.   :25.0   Max.   :120

```{r table1, results='asis'} 
library(xtable)
data(cars)
print(xtable(summary(cars), caption = "Cars Data",
floating = FALSE, label = "tab:coef"), type = "html", include.rownames = F)
```

library(xtable)
data(cars)
print(xtable(summary(cars), caption = "Cars Data", floating = FALSE, label = "tab:coef"), 
    type = "html", include.rownames = F)

Cars Data

speed	dist
Min. : 4.0	Min. : 2
1st Qu.:12.0	1st Qu.: 26
Median :15.0	Median : 36
Mean :15.4	Mean : 43
3rd Qu.:19.0	3rd Qu.: 56
Max. :25.0	Max. :120

The outcome in your html file is:

## <!-- html table generated in R 2.15.1 by xtable 1.7-1 package -->
## <!-- Sun Feb 16 23:55:02 2014 -->
## <TABLE border=1>
## <CAPTION ALIGN="bottom"> Cars Data </CAPTION>
## <TR> <TH>     speed </TH> <TH>      dist </TH>  </TR>
##   <TR> <TD> Min.   : 4.0   </TD> <TD> Min.   :  2   </TD> </TR>
##   <TR> <TD> 1st Qu.:12.0   </TD> <TD> 1st Qu.: 26   </TD> </TR>
##   <TR> <TD> Median :15.0   </TD> <TD> Median : 36   </TD> </TR>
##   <TR> <TD> Mean   :15.4   </TD> <TD> Mean   : 43   </TD> </TR>
##   <TR> <TD> 3rd Qu.:19.0   </TD> <TD> 3rd Qu.: 56   </TD> </TR>
##   <TR> <TD> Max.   :25.0   </TD> <TD> Max.   :120   </TD> </TR>
##    <A NAME=tab:coef></A>
## </TABLE>

The rest, you are able to add some style by using CSS…

How to upgrade R version on Ubuntu

There are lots of directives on the web how to upgrade R version or installing the latest version of R. Here I am going to tell the clearest and success way that I have done.

Open your terminal (Ctrl+Alt+T) 

1. Uninstall current R version on your system

sudo apt-get remove r-base-core

2. Add cran.rstudio deb to sources.list

sudo nano /etc/apt/sources.list    

Paste the below code in to your sources.list

deb http://cran.rstudio.com/bin/linux/ubuntu precise/

My version is "precise".  That's why the line ends with "precise". You can learn your Ubuntu version:

lsb_release -a

Codename is your version....

3. Add key to sign CRAN packages

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E084DAB9

4. Add PPA (for CRAN) to your system

sudo add-apt-repository ppa:marutter/rdev
sudo apt-get update
sudo apt-get upgrade

5. Install R again 

sudo apt-get install r-base

If you want to check the version of your R. Open terminal, enter R and type:

version

That's all.....