Add rmf list class to data.frame and check if k, i and j columns are present

Add rmf list class to data.frame and check if k, i and j columns are present

rmf_create_list(df, kper = NULL)

Arguments

df	data.frame that holds at least the k, i and j columns that specify cell indices as well as additional variables related to the boundary condition package.
kper	numeric vector with the stress period numbers during which the list is active.

Value

an object of class rmf_list and data.frame

Details

 rmf_lists represent List Data input (and output) as used by MODFLOW. rmf_lists are used to define stress period input for boundary condition packages; 
 to define parameters and to read certain types of output in the the cell-by-cell budget file. A MODFLOW List Data can be viewed as discrete spatial features in contrast to the MODFLOW array data type which represents continuous data.
 
 A rmf_list is a dataframe with at least 3 integer columns k, i and j, that may contain repeated values.