```
remConstCols <- function(x, verbose = TRUE)
{
if (!is.matrix(x)) dim(x) <- c(length(x),1)
sdev <- apply(x,2,sd)
const <- which(sdev < 1e-8)
if (verbose)
cat(paste('\n', length(const), 'columns removed\n'))
if (length(const) == 0)
return(x) else return(x[,-const])
}
```

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