USGS - science for a changing world  Water Resources of the
United States   U.S. Geological Survey Water-Resources
Investigations Report 94-468  Entering Two-Dimensional Arrays
There are three methods that can be used to define two-
dimensional arrays. These correspond to the three methods that
MODFLOW and MODPATH use for defining arrays. The first method,
referred to as the constant method, is to make the entire array
a constant. The second, or package, method is to store
individual array elements in the appropriate MODFLOW package
file (or MODPATH file) along with other data. When the package
method is used, MFI allows the values for individual array
elements to be entered or modified by invoking a spreadsheet
program. MFI writes the array-element values in the appropriate
package file when exited. For an existing dataset, the initial
values for a package array are read from the appropriate package
file. The third, or separate, method is to specify that the
values for individual array elements are in a sepa