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Pick the value in the center of a square matrix. Auxiliary function to be used by functions called by focal.function().
focal.function()
centervalue(x)
value of the matrix entry in the middle of the matrix
a square matrix
See for example the code of resid.median(). Intended for use with square moving window matrices with an odd number of columns and rows.
resid.median()
focal.function(), resid.median()
( m <- matrix( round(runif(9,1,10)), ncol=3 ) ) centervalue(m)
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