Nothing

```
# This code is based on the Matlab implementations of PLP and Rasta
# feature calculations by Daniel P. W. Ellis of Columbia University /
# International Computer Science Institute. For more details, see:
# http://www.ee.columbia.edu/~dpwe/resources/matlab/rastamat/
bark2hz <- function(z){
if(!is.numeric(z) || z < 0)
stop("frequencies have to be non-negative")
# Hynek's formula (taken from rasta/audspec.c)
600 * sinh(z/6)
}
```

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