rowPrev

rowPrev(X)

Please see rowFunctions for the parameters and calculation rules.

For each row in X, rowPrev shifts the elements to the right for one position.

m=matrix([4.5 2.6 1.5, 1.5 4.8 5.9, 4.9 2.0 NULL])
rowPrev(m)
// output
col1        col2    col3

          4.5         1.5

          2.6         4.8

          1.5         5.9


  $ a=array(INT[], 0, 10).append!([1 2 3, 4 5, 6 7 8]);

  $ rowPrev(a)

  [[00i,1,2],[00i,4],[00i,6,7]]


  $ tp = [[1.3,2.5,2.3], [4.1,5.3,6.2]]
tp.setColumnarTuple!()
rowPrev(tp)
// output
[[00F,1.3,2.5],[00F,4.1,5.3]]