DU {spreval} | R Documentation |
DU of sprinkler irrigation system
Description
Computes DU (distribution uniformity of low quarter) for sprinkler systems using catch can data.
Usage
DU(x)
Arguments
x |
numeric array of catch can data. Array may include missing (NA) data. NA values will be removed in function. |
Details
mean of lowest quarter of observations divided by overall mean X 100
Value
Distribution Uniformity (of low quarter) in percentage
Author(s)
Garry Grabow glgrabow@ncsu.edu
References
Keller, J., and R. D. Bliesner. 2000. Sprinkler and Trickle Irrigation. Caldwell, N.J.: Blackburn Press. ISBN 1-930665-19-9.
See Also
Examples
# data below are volumes caught in ml. Catch cans must be of
# equal surface area at top when using volume data
x<-c(47,42,45,24,13,26,33,34,27,30,40,44,32,12,12)
xdu<-DU(x)
#round results
durnd<-round(xdu,2)
xdu
durnd
[Package spreval version 1.1.0 Index]