Autodesk AUTOCAD 2006 Command Reference Manual page 106

Columns
Specifies the number of columns in the array.
If you specify one column, you must specify more than one row. If you specify
a large number of rows and columns for the array, it might take a while to
create the copies. By default, the maximum number of array elements that
you can generate in one command is 100,000. The limit is set by the
MAXARRAY setting in the registry. To reset the limit to 200,000, for example,
enter (setenv "MaxArray" "200000") at the Command prompt.
Offset Distance and Direction
Provides a space for you to specify the distance and direction of the array's
offset.
Row Offset
Specifies the distance (in units) between rows. To add rows downward,
specify a negative value. To specify row spacing with the pointing device,
use the Pick Both Offsets button or the Pick Row Offset button.
Column Offset
Specifies the distance (in units) between columns. To add columns to the
left, specify a negative value. To specify column spacing with the pointing
device, use the Pick Both Offsets button or the Pick Column Offset button.
Angle of Array
Specifies the angle of rotation. This angle is normally 0, so the rows and
columns are orthogonal with respect to the X and Y drawing axes of the
current UCS. You can change the measurement conventions for angles
using UNITS. The ANGBASE and ANGDIR system variables affect the angle
of arrays.
Pick Both Offsets
Temporarily closes the Array dialog box so that you can use the pointing
device to set the row and column spacing by specifying two diagonal corners
of a rectangle.
Pick Row Offset
Temporarily closes the Array dialog box so that you can use the pointing
device to specify the distance between rows. ARRAY prompts you to specify
two points and uses the distance and direction between the points to specify
the value in Row Offset.
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