R help - Jan 2009 - How-To extract data from a matrix of lists subject to a set of given constraints

My goal is to store the DWT coefficients from a number of time series in such a
way to be able to extract subsets satisfying giben conditions.
I have defined the following 11 matrices whose x-axis represent time intervals
and y-axis represent the number of time series:

  MS  <- 11      d1.mat <-   matrix (data=list(), nrow=TotNumCycles,
ncol=2^(MS-1))
  d2.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-3))
  d3.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-3))
  d4.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-4))
  d5.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-5))
  d6.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-6))
  d7.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-7))
  d8.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-8))
  d9.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-9))
  d10.mat <- matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-10))
  d11.mat <- matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-11))

Each di.mat (i=1,2,...,11) matrix slot is assigned a DWT coefficient modulus and
the signal and cycle number it belongs to:

  coef <- abs (as.numeric (aa.dwt$data[[n]]))     #GET DWT COEFFICIENTS
  ..........................................................
  for (k in 1:length(coef)) {
     d7.mat [[nCycle ,k]] <- list (data=coef
[k],variable=paste(insig,":",cyc,sep=""))
  }
 
As a consequence d7.mat contains the following:
      [,1]   [,2]   [,3]   [,4]   [,5]   [,6]   [,7]   [,8]   [,9]   [,10]
   [1,] List,2 List,2 List,2 List,2 NULL   NULL   NULL   NULL   NULL   NULL  My
goal is to store the DWT coefficients from a number of time series in such a way
to be able to extract subsets satisfying giben conditions.
I have defined the following 11 matrices whose x-axis represent time intervals
and y-axis represent the number of time series:

  MS  <- 11      d1.mat <-   matrix (data=list(), nrow=TotNumCycles,
ncol=2^(MS-1))
  d2.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-3))
  d3.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-3))
  d4.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-4))
  d5.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-5))
  d6.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-6))
  d7.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-7))
  d8.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-8))
  d9.mat <-   matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-9))
  d10.mat <- matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-10))
  d11.mat <- matrix (data=list(), nrow=TotNumCycles, ncol=2^(MS-11))

Each di.mat (i=1,2,...,11) matrix slot is assigned a DWT coefficient modulus and
the signal and cycle number it belongs to:

  coef <- abs (as.numeric (aa.dwt$data[[n]]))     #GET DWT COEFFICIENTS
  ..........................................................
  for (k in 1:length(coef)) {
     d7.mat [[nCycle ,k]] <- list (data=coef
[k],variable=paste(insig,":",cyc,sep=""))
  }
 
As a consequence d7.mat contains the following:
      [,1]   [,2]   [,3]   [,4]   [,5]   [,6]   [,7]   [,8]   [,9]   [,10]
   [1,] List,2 List,2 List,2 List,2 NULL   NULL   NULL   NULL   NULL   NULL 
   [2,] List,2 List,2 List,2 List,2 NULL   NULL   NULL   NULL   NULL   NULL 
   [3,] List,2 List,2 List,2 List,2 NULL   NULL   NULL   NULL   NULL   NULL 
   [4,] List,2 List,2 List,2 List,2 NULL   NULL   NULL   NULL   NULL   NULL 
   [5,] List,2 List,2 List,2 List,2 NULL   NULL   NULL   NULL   NULL   NULL 
   [6,] List,2 List,2 List,2 List,2 NULL   NULL   NULL   NULL   NULL   NULL 
   [7,] List,2 List,2 List,2 List,2 NULL   NULL   NULL   NULL   NULL   NULL 
   [8,] List,2 List,2 List,2 NULL   NULL   NULL   NULL   NULL   NULL   NULL 
   [9,] List,2 List,2 List,2 List,2 NULL   NULL   NULL   NULL   NULL   NULL 
 ................................................................................................................
> d5.mat[[3,4]]
$data
[1] 0.6290917

$variable
[1] "10146:3"
> d5.mat[[6,4]]
$data
[1] 1.187133

$variable
[1] "10146:6"
> d5.mat[[8,4]]
NULL
> d5.mat[[10,4]]
$data
[1] 0.7789786

$variable
[1] "10146:10"
> d5.mat[[50,4]]
$data
[1] 0.8909976

$variable
[1] "10146:50"

How can I extract, for instance, all the data from the i_th  column of the
matrix  that satisfy a given conditon?
In the case of a matrix A made up of numbers I would write :
which (A [,i] > 0.1) ...?

Thank you in advance for your help.
Maura








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