isplitRows: Create an iterator that splits a matrix into block rows

In itertools: Iterator Tools

Description

Create an iterator that splits a matrix into block rows. You can specify either the number of blocks, using the chunks argument, or the maximum size of the blocks, using the chunkSize argument.

Usage

isplitRows(x, ...)

Arguments

x	Matrix to iterate over.
...	Passed as the second and subsequent arguments to idiv function. Currently, idiv accepts either a value for chunks or chunkSize.

Value

An iterator that returns submatrices of x.

See Also

idiv, isplitCols

Examples

# Split a matrix into submatrices with a maximum of three rows
x <- matrix(1:100, 10)
it <- ihasNext(isplitRows(x, chunkSize=3))
while (hasNext(it)) {
  print(nextElem(it))
}

# Split the same matrix into five submatrices
it <- ihasNext(isplitRows(x, chunks=5))
while (hasNext(it)) {
  print(nextElem(it))
}

Example output

Loading required package: iterators
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,]    1   11   21   31   41   51   61   71   81    91
[2,]    2   12   22   32   42   52   62   72   82    92
[3,]    3   13   23   33   43   53   63   73   83    93
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,]    4   14   24   34   44   54   64   74   84    94
[2,]    5   15   25   35   45   55   65   75   85    95
[3,]    6   16   26   36   46   56   66   76   86    96
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,]    7   17   27   37   47   57   67   77   87    97
[2,]    8   18   28   38   48   58   68   78   88    98
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,]    9   19   29   39   49   59   69   79   89    99
[2,]   10   20   30   40   50   60   70   80   90   100
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,]    1   11   21   31   41   51   61   71   81    91
[2,]    2   12   22   32   42   52   62   72   82    92
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,]    3   13   23   33   43   53   63   73   83    93
[2,]    4   14   24   34   44   54   64   74   84    94
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,]    5   15   25   35   45   55   65   75   85    95
[2,]    6   16   26   36   46   56   66   76   86    96
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,]    7   17   27   37   47   57   67   77   87    97
[2,]    8   18   28   38   48   58   68   78   88    98
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,]    9   19   29   39   49   59   69   79   89    99
[2,]   10   20   30   40   50   60   70   80   90   100

itertools documentation built on May 2, 2019, 2:26 p.m.