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| general_commands [2008/01/24 13:48] – heidi | general_commands [2011/03/07 16:54] (current) – heidi |
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| ====== general commands ====== | ====== general commands ====== |
| | * ''install.packages("packageName")'': download and install a package --> start R as following: ''Rgui.exe --internet2'' |
| | * ''help(package=XML)'': information about the package XML |
| | * ''str(a)'': display the structure of a object |
| | * ''table(x)'': returns a table with the numbers of the different values of x |
| * ''[]'': subscript a string | * ''[]'': subscript a string |
| * ''as.matrix.data.frame(''data'')'': convert data to a matrix | * ''as.matrix.data.frame(''data'')'': convert data to a matrix |
| * ''skip=n'': begin to read rows after n rows | * ''skip=n'': begin to read rows after n rows |
| * ''row.names=n'': the row names are in column n or a vector giving the actual row names | * ''row.names=n'': the row names are in column n or a vector giving the actual row names |
| | * ''nrows=n'': read maximal n rows |
| * ''fill=TRUE'': show missing values | * ''fill=TRUE'': show missing values |
| * ''na.strings="''N.A.''"'': transform N.A. in NA (missing values) | * ''na.strings="''N.A.''"'': transform N.A. in NA (missing values) |
