1 Ch 9-10 lSubsetting lOrdering lArray operations lIteration © Fall 2004 Don Edwards and the University of South Carolina.

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Presentation transcript:

1 Ch 9-10 lSubsetting lOrdering lArray operations lIteration © Fall 2004 Don Edwards and the University of South Carolina

2 9 Subsetting and sorting lExtraction with “[]” for vectors and matrices l: and c() lRows, columns, and sub-matrices lIndices are not extracted lExtraction with logical vectors lStatements look self-referential

3 9 Subsetting and sorting lOrder function lCreates vector of indices that can then be used to “extract” ordered data files lLike a logical vector, the focus is on the index object, not the output object lSort function lacks functionality

4 10 Matrix operations lSplus was very inefficient at looping lR is improved lBoth Splus and R have built-in iterative capabilities lFunctions that operate on vectors and arrays lThe apply() function ltapply() works on groups

5 10 Matrix operations lIf we need to iterate, we use for() and while() statements lfor() uses a counter lwhile() uses a logical comparison lIf for() is slow, R can call both C++ and Fortran subroutines