dpssclear
Remove discrete prolate spheroidal sequences from database
Description
dpssclear(
removes sequences with length seqLength
,timeHalfBW
)seqLength
and time-half-bandwidth product
timeHalfBW
from the DPSS MAT-file database
dpss.mat
. Create the dpss.mat
file using dpsssave
.
Examples
Clear Database of Slepian Sequences
Generate four Slepian sequences. Each sequence has 128 sequences and time-half-bandwidth product of 3, 6, 9, and 12.
sL = [128 128 128 128]; % Segment length tHBW = [3 6 9 12]; % Time-half-bandwidth product for k=1:length(sL) [dpsSeq,lambda] = dpss(sL(k),tHBW(k)); dpsssave(tHBW(k),dpsSeq,lambda); end
Clear the sequence with a time-half-bandwidth product of 6.
seqLength = 128; timeHalfBW = 6; dpssclear(seqLength,timeHalfBW);
List the variable information of the modified Slepian sequence database file. The second sequence is empty.
whos -file dpss.mat
Name Size Bytes Class Attributes E1 128x6 6144 double E2 0x0 0 double E3 128x18 18432 double E4 128x24 24576 double V1 6x1 48 double V2 0x0 0 double V3 18x1 144 double V4 24x1 192 double index 1x1 1091 struct next_key 1x1 8 double
Input Arguments
seqLength
— Sequence length
positive integer
Sequence length, specified as a positive integer.
Data Types: single
| double
timeHalfBW
— Time-half-bandwidth product
positive scalar
Time-half-bandwidth product, specified as a positive scalar. This argument must be
less than seqLength/2
.
Data Types: single
| double
More About
Structure of DPSS MAT- file Database
The dpsssave
function creates and stores a file named
dpss.mat
with the DPSS (Slepian sequences) that you generate with the
dpss
function.
The dpsssave
function assigns a location key (1
,
2
, …, n
) and a name (E1
,
V1
, E2
, V2
, ...,
En
, Vn
) for each Slepian sequence that it
generates and stores it in the dpss.mat
file, from the first to the
nth sequence.
A dpss.mat
file with n sequences presents the
following structure:
E1
,E2
, …,En
— Slepian sequences.V1
,V2
, …,Vn
— Frequency-domain energy concentration ratios.index
— Database index, astruct
array with information of the list of sequence lengths, time-half bandwidth products and locations of the Slepian sequences stored in the DPSS MAT-file database. This structure array comprises of the following fields:N
— Vector of sequence lengths. Thedpsssave
function assigns a single entry inN
for each different value of sequence length.Wlist
— Structure array of time-half bandwidth productsNW
and sequence location numberskey
. Thedpsssave
function assigns a sequence locationkey
to each Slepian sequence each time you call it.
next_key
— Next-sequence identification key, defined asnext_key=n+1
wheren
is the number of Slepian sequences stored in the DPSS MAT-file database.
Version History
Introduced before R2006a
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