R documentation with graphics

R documentation with graphics

specifying printer lpr

    lpr -#2 -sP dj thesis.txt
This command will create a symbolic link to the file thesis.txt in the spool 
directory for the printer named dj, where it would be processed by lpd. 
It would then print a second copy of thesis.txt.

bold greek letters latex

% use bm package
\usepackage{bm}

% inside math mode
\[  ... {\bm beta} ... \]

better than \boldmath because it works within math mode directly, 
no need to use in text mode.

logit - expit

%% maps (0,b) into (-inf,inf)
%% inverse of expit
%% usage: logit(x,b) or logit(x) 
%% b defaults to 1
function y = logit(x,b) 
  if nargin<2
    b = 1;
  end
  y = log( x ./ (b - x) );

%% maps (-inf, inf) into (0,b)
%% inverse of logit
%% usage: expit(x,b) or expit(x) 
%% b defaults to 1
function y = expit(x,b) 
  if nargin<2
    b = 1;
  end
  y =  b./(1+exp(-x)) ;

xcdroast

to copy files to CD in linux
> xcdroast

psnup

psnup -d -8 oldfile.ps newfile.ps
many postscript pages in one

R equivalent of repmat (matlab)

repmat = function(X,m,n){
##R equivalent of repmat (matlab)
mx = dim(X)[1]
nx = dim(X)[2]
matrix(t(matrix(X,mx,nx*n)),mx*m,nx*n,byrow=T)