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--- notes:r_cheat_sheet [2026/11/03 01:35]
195.180.29.101 old revision restored (2026/09/03 16:09)
+++ notes:r_cheat_sheet [2026/11/03 05:09] (current)
157.100.198.61 old revision restored (2026/08/03 07:09)
@@ Line 20: / Line 20: @@
   * ''myseq[3]'' to access third element i.e. vectors indexed starting at 1.
   * Use a vector as an index to access multiple elements e.g. ''myseq[c(1,3)]''
-  * The ''names'' function can be used to assign names to vector elements. Once names are asigned, they can be sed as indices e.g. <code>
+  * The ''names'' function can be used to assign names to vector elements. Once names are asigned, they can be used as indices e.g. <code>
 names(myseq)=c('one','two','three')
 myseq['two']</code>
@@ Line 28: / Line 28: @@
 ===== Plotting =====
-  * ''barplot[myseq]'' creates a bar plot of the ''myseq'' vector.
+  * ''barplot[myseq]'' creates a bar plot of the ''myseq'' vector. ''abline(h=y)'' plots a horizontal line at height y.
   * ''plot[x,y]'' plots x vs y e.g. <code>
 x=seq[0,20,.1]
@@ Line 43: / Line 43: @@
   * dim(myseq) can be used to change dimensions of a matrix
   * ''mymatrix[3,4]'' returns an element of the matrix (row,column).
-  * ''mymatrix[,2] returns entire second column.
+  * ''mymatrix[,2]'' returns entire second column.
+===== Statistics =====
+  * ''mean(myvec)'' returns the mean.
 ===== File Handling =====
   * ''list.files()'' to list files in furrent directory
   * ''source("file.R")'' to load file of code

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