I forgot to answer to the last part of your question.
I think what you call a list is actually an element of a list, right?
If so, the command you want depends on the way you want to combine these
elements.

For example, the following lines will extract columns 12 and 13 of any
array-like element of your list and bind them into columns of a same array
(if all your elements have the same number of rows).

List2 <- lapply (NameOfYourList, function (dat, NumCol) dat[,NumCol],
c(12,13))
Array2 <- do.call (cbind, List2)

If you meant something else by 'combine", please be more explicit.

Nael





On Fri, May 23, 2008 at 3:54 PM, N. Lapidus <n.lapidus@gmail.com> wrote:

> Hi Mohamed
>
> Try:
> lapply (NameOfYourList, function (dat, NumCol) dat[,NumCol], c(12,13))
>
> But there must be a shorter way to write this.
>
> Nael
>
>
> On Fri, May 23, 2008 at 3:37 PM, mohamed nur anisah <
> nuranisah_mohamed@yahoo.com> wrote:
>
>> Dear all,
>>
>>  i have 2 lists of data with each of the list contain 14 columns. How am i
>> going to extract column 12 and 13 from each of the list ?? and can i combine
>> my extracted columns to form a single list. Attach with are my data. Your
>> coorperation is highly appreciated. Many thanks
>>
>>  Regards,
>>   Anisah
>>
>>
>> [[1]]
>>   CS(O)   id no.anchor   ref loc.start  loc.end CS(O).size
>> CS(O)ref.density tested loc.start  loc.end breakp.start breakp.end den of
>> anchor
>> 1     CS  2.0         3 mmu19   6465196  6978022     512826
>>  6  cfa18  55567952 55782336      6978022    6992734            28
>> 2     CS  3.0        57 mmu19   6992734 10249966    3257232
>> 17  cfa18  55792632 57688808     10249966   10277430            25
>> 3     CS  4.0        21 mmu19  10277430 10955201     677771
>> 31  cfa18  57721864 58419812     10955201   11008526            36
>> 4     CS  5.0         2 mmu19  11008526 11045352      36826
>> 54  cfa18  58462088 58518608     11045352   11316865            32
>> 5     CS  6.0         7 mmu19  11316865 11814604     497739
>> 14  cfa21  53902028 53514536     11814604   11937228            37
>> 6     CS  7.0        14 mmu19  11937228 13847633    1910405
>>  7  cfa18  40111560 41204940     13847633   14515091            17
>> 7     CS  8.0         3 mmu19  14515091 16022770    1507679
>>  2   cfa1  82195232 83511824     16022770   16199850             5
>> 8     CS  9.0        25 mmu19  16199850 23625856    7426006
>>  3   cfa1  83903856 90638880     23625856   23754554            14
>> 9     CS 10.0        33 mmu19  23754554 29676192    5921638
>>  6   cfa1  90773872 96913624     29676192   29763918            16
>> 10    CS 11.0         6 mmu19  29763918 30164446     400528
>> 15  cfa11  29919668 30510776     30164446   30611872             8
>> 11    CS 12.0        19 mmu19  30611872 34558312    3946440
>>  5  cfa26  38767664 41958808     34558312   34734404            15
>> 12   CSO 13.1        73 mmu19  34734404 44009616    9275212
>>  8  cfa28   7343952 15872122     44009616   44088256            21
>> 13   CSO 13.2        71 mmu19  44088256 53582632    9494376
>>  7  cfa28  15923283 24830712     53582632   53654796            14
>>
>> [[2]]
>>   CS(O)   id no.anchor  ref loc.start   loc.end CS(O).size
>> CS(O)ref.density tested loc.start   loc.end breakp.start breakp.end den of
>> anchor
>> 1    CSO  2.1         4 mmuX   7311438   7428353     116915
>> 34   cfaX  41732964  41660008      7428353    8356932            16
>> 2    CSO  2.2        41 mmuX   8356932  20225456   11868524
>>  3   cfaX  32299338  41540632     20225456   20641584            13
>> 3    CSO  2.3         8 mmuX  20641584  33046200   12404616
>>  1   cfaX  91770240  94412912     33046200   33175188            15
>> 4    CSO  3.1        73 mmuX  33175188  57970280   24795092
>>  3   cfaX  94538728 114133200     57970280   64939220             3
>> 5    CSO  3.2        29 mmuX  64939220  70011280    5072060
>>  6   cfaX 119319152 124625688     70011280   70039784            32
>> 6     CS  4.0        21 mmuX  70039784  70677328     637544
>> 33   cfaX 124652504 125280776     70677328   71241272            29
>> 7    CSO  5.1         2 mmuX  71241272  71362456     121184
>> 17   cfaX 125764816 125872960     71362456   71425576            14
>> 8    CSO  6.1         4 mmuX  71425576  71824776     399200
>> 10   cfaX 125917392 126261784     71824776   73894168             6
>> 9    CSO  6.2         2 mmuX  73894168  74014744     120576
>> 17   cfaX   6363930   1898656     74014744   74705408            11
>> 10   CSO  6.3        17 mmuX  74705408  90487648   15782240
>>  1   cfaX  32034930  19573208     90487648   91228160            10
>> 11   CSO  6.4        49 mmuX  91228160 101058192    9830032
>>  5   cfaX  51733740  61930260    101058192  101967264             9
>> 12    CS  7.0         3 mmuX 101967264 102176888     209624
>> 14   cfaX  62797768  63194052    102176888  102230040            11
>> 13   CSO  8.1         2 mmuX 102230040 102409592     179552
>> 11   cfaX  63307688  63460248    102409592  103123352             9
>> 14   CSO  8.2        16 mmuX 103123352 110591464    7468112
>>  2   cfaX  63896752  71000280    110591464  116044144             2
>> 15    CS  9.0         2 mmuX 116044144 116407200     363056
>>  6   cfaX  71543016  71752808    116407200  118512328             1
>> 16    CS 10.0        24 mmuX 118512328 131185424   12673096
>>  2   cfaX  72291072  79468544    131185424  131616688            20
>> 17    CS 11.0         8 mmuX 131616688 132395992     779304
>> 10   cfaX  79821128  80586408    132395992  132461760            17
>> 18    CS 12.0        21 mmuX 132461760 137564368    5102608
>>  4   cfaX  80674704  85936464    137564368  137927776            12
>> 19   CSO 13.1        14 mmuX 137927776 142716752    4788976
>>  3   cfaX  86288848  90933784    142716752  145888160             5
>> 20   CSO 13.2        16 mmuX 145888160 147685360    1797200
>>  9   cfaX  46726104  44854128    148377392  148480704            12
>> 21    CS 14.0         3 mmuX 148480704 148838944     358240
>>  8   cfaX  47357568  47895460    148838944  150553856             7
>> 22    CS 15.0        12 mmuX 150553856 154876816    4322960
>>  3   cfaX  19415076  15808253    154876816  154971520             8
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
>

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