centre.log: logs and rescales a numeric matrix
In FRSstats: FRS Statistics Group R Library

Description Usage Arguments Details Value Note Author(s) References See Also Examples

takes the log of a real valued matrix, removes any columns where there are less than three finite values, and scales the values to lie between zero and 1.

1	centre.log(mat)

mat

a numeric n by p matrix, with 0's and possibly with NAs

No details

a numeric matrix of dimension n by q < p containing values between 0 and 1

intended to be used within the plots.index.corr function

Colin Millar

no references

plots.index.corr

## The function is currently defined as
function(mat)
{
  mat[mat<=0] <- NA
  mat <- log(mat)
  mat <- mat[,apply(mat,2,function(x) sum(!is.na(x))>2)]
  apply(mat,2,function(x) (x-min(x, na.rm=T))/diff(range(x,na.rm=T)))
  }