corner <- function(X,corner=1,n=5)
{
d <- dim(X)
if (corner==1) return(X[1:n,1:n])
if (corner==2) return(X[1:n,(d[2]-n+1):d[2]])
if (corner==3) return(X[(d[1]-n+1):d[1],1:n])
if (corner==4) return(X[(d[1]-n+1):d[1],(d[2]-n+1):d[2]])
}
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