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Syntax |
`dpss(` N`, ` m`, ` w`)` |

See Also | fspec |

Returns discrete prolate spheroidal sequences, where

`0 < `*w* < .5

, with a suggested value of `4./`*N*.

The sequence of order *i*

is placed in the
*i* = 0, ... , *m* - 1

.
The return value has

These sequences are used as tapers for spectral estimation
(see fspec
).
There are two important factors corresponding to a taper:
its bandwidth (how wide a frequency range it allows leakage over)
and its rejection
(how much energy is reduced when it is outside that frequency range).
If ```
```

N = 128

m = 1

w = 4d0 / N

S = dpss(N, m, w)

gtitle("Discrete Prolate Spheroidal Window")

gplot(seq(N)/double(N), S)

returns the following plot: