Nothing

```
#
# Originally written by Karim Rahim based on Percival and Walden (1993), and
# updated to use LAPACK. Makes use of technique found in David Thomson's F77 code for
# reducing the tridiagonal matrix in half, based on Slepian technical memo,
# Bell Labs (1977).
#
# Changes made by Wesley Burr, 2013. Eigenvalues not included in formulation,
# as they are not needed, and speed is a priority.
#
# If you wish to report bugs please contact the maintainer:
#
# Wesley Burr
# <wesley.burr@gmail.com>
##########################################################
#
# .dpss
#
# Generates k orthogonal Discrete Prolate Spheroidal
# Sequences (dpss) using the tridiagonal method. See
# Slepian (1978), page 1379 and Percival and Walden (1993),
# Chapter 8.4.
#
# Very similar to 'dpss' in pkg:multitaper, but without
# eigenvalues.
#
##########################################################
.dpss <- function(n, k, nw) {
stopifnot(n >= 1, nw/n >0, nw/n < 0.5, k >= 1)
# if(k > 2 * nw) { warning("dpss: Generating sequences with _very_ poor in-band properties. K > 2NW.") }
## If k is passed in as floating point, the cast to
## as.integer() in the Fortran call does not quite work properly
## - wburr, 2013
if(!is.integer(k)) {
k<-as.integer(floor(k));
}
## 'eigen' is of appropriate length for LAPACK functions.
## This call uses LAPACK functions in place of the
## EISPACK functions referenced in Percival and Walden (1993).
## Code ported to F90 by krahim.
out <- .Fortran("dpss", as.integer(n), as.integer(k),
as.double(nw), v=double(n*k), eigen=double(k),
PACKAGE='slp')
out <- matrix(data=out$v, nrow=n, ncol=k, byrow=FALSE)
class(out) <- "dpss"
return(out)
}
```

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