[R] How to know the row number of raw matrix after resampling?

[Gabor Grothendieck]

For your first question the simplest way to handle it is to 
sample the indices rather than the data.  For example,

x <- seq(10,200,10) # data
ix <- sample(length(x),10,rep=T) # 10 samples from 1:length(x)
s <- x[ix]  # samples

Now ix has the indices of s.


Taemyong Choi <tmchoi <at> ris.chonnam.ac.kr> writes:

: 
: > DATA
: 
:             [,1]
: 
:  [1,] -2.0314185
: 
:  [2,] -0.3594015
: 
:  [3,] -1.3225832
: 
:  [4,]  1.5050892
: 
:  [5,] -0.4535558
: 
:  [6,]  3.6335036
: 
:  [7,]  5.1965750
: 
:  [8,]  4.2923129
: 
:  [9,]  6.0913187
: 
: [10,]  4.9131070
: 
: > RESA
: 
:            [,1]       [,2]       [,3]       [,4]       [,5]
: 
: [1,] -2.0314185  1.5050892 -1.3225832 -1.3225832 -2.0314185
: 
: [2,] -0.3594015 -0.3594015  4.2923129 -0.3594015 -0.4535558
: 
: [3,]  4.9131070  4.9131070 -2.0314185  4.9131070  3.6335036
: 
: [4,]  3.6335036 -0.4535558  3.6335036  1.5050892 -0.3594015
: 
: [5,]  1.5050892  6.0913187 -0.3594015  4.2923129  6.0913187
: 
: [6,]  6.0913187  3.6335036  5.1965750 -2.0314185  5.1965750
: 
: [7,] -0.4535558  5.1965750  6.0913187  3.6335036  4.9131070
: 
: First,
: 
: RESA matrix consists of resampling DATA matrix. I would like to know the row
: number of RESA matrix's value in DATA matrix.
: 
: For example, RESA[1,1] = -2.0314185 and its row number in DATA matrix is 1.
: 
:                   RESA[1,3]=4.9131070 and its row number in DATA matrix is
: 10.
: 
: Is there a simple way to know the row number?
: 
: I
: 
: > clus
: 
:      col1 col2 col3 col4 col5
: 
: [1,]    1    1    1    1    1
: 
: [2,]    2    2    0    2    1
: 
: [3,]    2    1    1    2    2
: 
: [4,]    1    2    2    1    2
: 
: [5,]    3    1    2    2    3
: 
: [6,]    3    3    0    3    2
: 
: [7,]    1    3    2    0    0
: 
: Second, I want to count columns of each row without 0
: 
: i.e. The number of clus[2,]'s columns is 4. 
: 
: I solve this with next code.
: 
: number <- c(rep(1,5))  # 5 is total column number.
: 
: sum(number[clus[2,]!=0]) 
: 
: Is there more simple method?
: 
: Finally, clus[2,]'s mode is 2. I try to find function to know mode, but I
: have failed.
: 
: What's the function to know mode?
: 
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