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dim(t1)  

attributes(t1)    #综合输出所有行名、列名、以及class结果。     

str(t1)    #显示每个变量的行列数和类型  

class(t1) #查看变量类型，vector、data.frame、matrix、factor、list

mode(t1) #查看数据大类，character、numeric、logical

typeof(t1) #查看数据细类，integer、double、single、float

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> dim(t1) #  NULL> > attributes(t1)    #综合输出所有行名、列名、以及class结果。     $seqnamesfactor-Rle of length 410519 with 30 runs  Lengths:                25139 ...                    9  Values :                 chr1 ...       chrUn_JH584304Levels(66): chr1 chr2 ... chrUn_GL456396 chrUn_JH584304

$strandfactor-Rle of length 410519 with 48 runs  Lengths: 12327 12812 16807 ...     8    19  Values :     +     -     + ...     +     -Levels(3): + - *

$rangesIRanges object with 410519 ranges and 0 metadata columns:               start       end     width                  [1]   4807788   4807982       195       [2]   4807823   4807982       160       [3]   4807830   4807982       153       [4]   4807892   4807982        91       [5]   4807896   4807982        87       ...       ...       ...       ...  [410515]     55112     55701       590  [410516]     56986     57151       166  [410517]     58564     58835       272  [410518]     58564     59690      1127  [410519]     59592     59667        76

$seqinfoSeqinfo object with 66 sequences (1 circular) from mm10 genome:  seqnames       seqlengths isCircular genome  chr1            195471971          mm10  chr2            182113224          mm10  chr3            160039680          mm10  chr4            156508116          mm10  chr5            151834684          mm10  ...                   ...        ...    ...  chrUn_GL456392      23629          mm10  chrUn_GL456393      55711          mm10  chrUn_GL456394      24323          mm10  chrUn_GL456396      21240          mm10  chrUn_JH584304     114452          mm10

$elementMetadataDataFrame with 410519 rows and 2 columns         exon_id      geneid       1             18       187772             19       187773             20       187774             21       187775             22       18777...          ...         ...410515    447554       66776410516    447555       66776410517    447556       66776410518    447557       66776410519    447558       66776

$elementType[1] "ANY"

$metadata$metadata$genomeInfo$metadata$genomeInfo$`Db type`[1] "TxDb"

$metadata$genomeInfo$`Supporting package`[1] "GenomicFeatures"

$metadata$genomeInfo$`Data source`[1] "UCSC"

$metadata$genomeInfo$Genome[1] "mm10"

$metadata$genomeInfo$Organism[1] "Mus musculus"

$metadata$genomeInfo$`Taxonomy ID`[1] "10090"

$metadata$genomeInfo$`UCSC Table`[1] "knownGene"

$metadata$genomeInfo$`UCSC Track`[1] "GENCODE VM23"

$metadata$genomeInfo$`Resource URL`[1] "http://genome.ucsc.edu/"

$metadata$genomeInfo$`Type of Gene ID`[1] "Entrez Gene ID"

$metadata$genomeInfo$`Full dataset`[1] "yes"

$metadata$genomeInfo$`miRBase build ID`[1] NA

$metadata$genomeInfo$transcript_nrow[1] "142446"

$metadata$genomeInfo$exon_nrow[1] "447558"

$metadata$genomeInfo$cds_nrow[1] "243727"

$metadata$genomeInfo$`Db created by`[1] "GenomicFeatures package from Bioconductor"

$metadata$genomeInfo$`Creation time`[1] "2019-10-21 20:52:26 +0000 (Mon, 21 Oct 2019)"

$metadata$genomeInfo$`GenomicFeatures version at creation time`[1] "1.37.4"

$metadata$genomeInfo$`RSQLite version at creation time`[1] "2.1.2"

$metadata$genomeInfo$DBSCHEMAVERSION[1] "1.2"

$class[1] "GRanges"attr(,"package")[1] "GenomicRanges"

> > str(t1)    #显示每个变量的行列数和类型  Formal class 'GRanges' [package "GenomicRanges"] with 7 slots  ..@ seqnames       :Formal class 'Rle' [package "S4Vectors"] with 4 slots  .. .. ..@ values         : Factor w/ 66 levels "chr1","chr2",..: 1 2 3 4 5 6 7 8 9 10 ...  .. .. ..@ lengths        : int [1:30] 25139 32977 18919 23826 26471 20448 34789 19936 23361 18793 ...  .. .. ..@ elementMetadata: NULL  .. .. ..@ metadata       : list()  ..@ ranges         :Formal class 'IRanges' [package "IRanges"] with 6 slots  .. .. ..@ start          : int [1:410519] 4807788 4807823 4807830 4807892 4807896 4807898 4807911 4808237 4808455 4828584 ...  .. .. ..@ width          : int [1:410519] 195 160 153 91 87 85 72 129 32 66 ...  .. .. ..@ NAMES          : NULL  .. .. ..@ elementType    : chr "ANY"  .. .. ..@ elementMetadata: NULL  .. .. ..@ metadata       : list()  ..@ strand         :Formal class 'Rle' [package "S4Vectors"] with 4 slots  .. .. ..@ values         : Factor w/ 3 levels "+","-","*": 1 2 1 2 1 2 1 2 1 2 ...  .. .. ..@ lengths        : int [1:48] 12327 12812 16807 16170 9829 9090 12035 11791 13416 13055 ...  .. .. ..@ elementMetadata: NULL  .. .. ..@ metadata       : list()  ..@ seqinfo        :Formal class 'Seqinfo' [package "GenomeInfoDb"] with 4 slots  .. .. ..@ seqnames   : chr [1:66] "chr1" "chr2" "chr3" "chr4" ...  .. .. ..@ seqlengths : int [1:66] 195471971 182113224 160039680 156508116 151834684 149736546 145441459 129401213 124595110 130694993 ...  .. .. ..@ is_circular: logi [1:66] NA NA NA NA NA NA ...  .. .. ..@ genome     : chr [1:66] "mm10" "mm10" "mm10" "mm10" ...  ..@ elementMetadata:Formal class 'DFrame' [package "S4Vectors"] with 6 slots  .. .. ..@ rownames       : NULL  .. .. ..@ nrows          : int 410519  .. .. ..@ listData       :List of 2  .. .. .. ..$ exon_id: int [1:410519] 18 19 20 21 22 23 24 25 26 27 ...  .. .. .. ..$ geneid : chr [1:410519] "18777" "18777" "18777" "18777" ...  .. .. ..@ elementType    : chr "ANY"  .. .. ..@ elementMetadata: NULL  .. .. ..@ metadata       : list()  ..@ elementType    : chr "ANY"  ..@ metadata       :List of 1  .. ..$ genomeInfo:List of 20  .. .. ..$ Db type                                 : chr "TxDb"  .. .. ..$ Supporting package                      : chr "GenomicFeatures"  .. .. ..$ Data source                             : chr "UCSC"  .. .. ..$ Genome                                  : chr "mm10"  .. .. ..$ Organism                                : chr "Mus musculus"  .. .. ..$ Taxonomy ID                             : chr "10090"  .. .. ..$ UCSC Table                              : chr "knownGene"  .. .. ..$ UCSC Track                              : chr "GENCODE VM23"  .. .. ..$ Resource URL                            : chr "http://genome.ucsc.edu/"  .. .. ..$ Type of Gene ID                         : chr "Entrez Gene ID"  .. .. ..$ Full dataset                            : chr "yes"  .. .. ..$ miRBase build ID                        : chr NA  .. .. ..$ transcript_nrow                         : chr "142446"  .. .. ..$ exon_nrow                               : chr "447558"  .. .. ..$ cds_nrow                                : chr "243727"  .. .. ..$ Db created by                           : chr "GenomicFeatures package from Bioconductor"  .. .. ..$ Creation time                           : chr "2019-10-21 20:52:26 +0000 (Mon, 21 Oct 2019)"  .. .. ..$ GenomicFeatures version at creation time: chr "1.37.4"  .. .. ..$ RSQLite version at creation time        : chr "2.1.2"  .. .. ..$ DBSCHEMAVERSION                         : chr "1.2"> > class(t1)#: 查看变量类型，vector、data.frame、matrix、factor、list[1] "GRanges"attr(,"package")[1] "GenomicRanges"> > mode(t1)#: 查看数据大类，character、numeric、logical[1] "S4"> > typeof(t1)#: 查看数据细类，integer、double、single、float[1] "S4"

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