caTools (version 1.7)

caTools-package: Miscellaneous tools: I/O, moving window statistics, etc.

Description

Contains several basic utility functions including: moving (rolling, running) window statistic functions, read/write for GIF and ENVI binary files, fast calculation of AUC, LogitBoost classifier, base64 encoder/decoder, round-off error free sum and cumsum, etc.

Details

ll{ Package: caTools Version: 1.6 Date: Apr 11 2006 Depends: R (>= 2.2.0), bitops Suggests: MASS, rpart License: The caMassClass Software License, Version 1.0 (See COPYING file or http://ncicb.nci.nih.gov/download/camassclasslicense.jsp) URL: http://ncicb.nci.nih.gov/download/index.jsp Built: R 2.2.1; i386-pc-mingw32; 2006-04-14 10:45:20; windows } Index: LogitBoost LogitBoost Classification Algorithm predict.LogitBoost Prediction Based on LogitBoost Algorithm base64encode Convert R vectors to/from the Base64 format colAUC Column-wise Area Under ROC Curve (AUC) combs All Combinations of k Elements from Vector v read.ENVI Read and Write Binary Data in ENVI Format read.gif Read and Write Images in GIF format runmean Moving Window Analysis of a Vector sample.split Split Data into Test and Train Set sum.exact Basic Sum Operations without Round-off Errors trapz Trapezoid Rule Numerical Integration

Examples

# GIF image read & write
  write.gif( volcano, "volcano.gif", col=terrain.colors, flip=TRUE, 
           scale="always", comment="Maunga Whau Volcano")
  y = read.gif("volcano.gif", verbose=TRUE, flip=TRUE)
  image(y$image, col=y$col, main=y$comment, asp=1)

  # test runmin, runmax and runmed
  k=25; n=200;
  x = rnorm(n,sd=30) + abs(seq(n)-n/4)
  col = c("black", "red", "green", "brown", "blue", "magenta", "cyan")
  plot(x, col=col[1], main = "Moving Window Analysis Functions (window size=25)")
  lines(runmin (x,k), col=col[2])
  lines(runmed (x,k), col=col[3])
  lines(runmean(x,k), col=col[4])
  lines(runmax (x,k), col=col[5])
  legend(0,.9*n, c("data", "runmin", "runmed", "runmean", "runmax"), col=col, lty=1 )

  # sum vs. sum.exact
  x = c(1, 1e20, 1e40, -1e40, -1e20, -1)
  a = sum(x);          print(a)
  b = sum.exact(x);    print(b)