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--- notes:r_cheat_sheet [2026/07/24 05:17]
177.47.199.210 old revision restored (2014/10/05 17:33)
+++ notes:r_cheat_sheet [2026/07/25 02:09] (current)
216.73.217.13 old revision restored (2026/07/24 19:11)
@@ Line 11: / Line 11: @@
   * Booleans are e.g. ''1=1'' , ''3>4'' , ''TRUE'', T, ''FALSE'', F
   * For variable assignment ''x=1'' or ''x<-1''
-  * For help on a function use ''help(sum)'' or ''example(sqrt)''
+  * For help on a function use ''help(sum)'' ,  ''help(package='ggplot2')''  or ''example(sqrt)''
   * Operations are ''+ - * / = <-''
   * ''NA'' is used to express a missing or unknown data  value. Expressions on NA return NA.
@@ Line 37: / Line 37: @@
   * ''persp(mymat)'' plots a contour map in perspective.
   * ''image(volcano)'' generates a heat map of the matrix.
+  * ''qplot(weights, prices, color=types)'' - more attractive plotting using ggplot2 package.
 ===== Matrices =====
@@ Line 67: / Line 67: @@
   * ''read.csv('mydat.csv')'' to load a csv file
   * ''read.table'' to read text data with other separators
+  * ''con<-url("http://google.com","r")'' to read a webpage
+  * ''x<=readLines(con)'' to convert to an array of lines

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