generate_kmers {transite} | R Documentation

## k-mer Counts for Sequence Set

### Description

Counts occurrences of k-mers of length `k` in the given set of sequences. Corrects for homopolymeric stretches.

### Usage

    generate_kmers(sequences, k)

### Arguments

`sequences` | character vector of DNA or RNA sequences
`k` | length of k-mer, either `6` for hexamers or `7` for heptamers

### Value

Returns a named numeric vector, where the elements are k-mer counts and the names are DNA k-mers.

### Warning

`generate_kmers` always returns DNA k-mers, even if `sequences` contains RNA sequences. RNA sequences are internally converted to DNA sequences. It is not allowed to mix DNA and RNA sequences.

### See Also

Other k-mer functions: `calculate_kmer_enrichment()`, `check_kmers()`, `compute_kmer_enrichment()`, `count_homopolymer_corrected_kmers()`, `draw_volcano_plot()`, `estimate_significance_core()`, `estimate_significance()`, `generate_permuted_enrichments()`, `run_kmer_spma()`, `run_kmer_tsma()`

### Examples

    # count hexamers in set of RNA sequences
    rna_sequences <- c(
      "CAACAGCCUUAAUU", "CAGUCAAGACUCC", "CUUUGGGGAAU",
      "UCAUUUUAUUAAA", "AAUUGGUGUCUGGAUACUUCCCUGUACAU",
      "AUCAAAUUA", "AGAU", "GACACUUAAAGAUCCU",
      "UAGCAUUAACUUAAUG", "AUGGA", "GAAGAGUGCUCA",
      "AUAGAC", "AGUUC", "CCAGUAA",
      "UUAUUUA", "AUCCUUUACA", "UUUUUUU", "UUUCAUCAUU",
      "CCACACAC", "CUCAUUGGAG", "ACUUUGGGACA", "CAGGUCAGCA"
    )
    hexamer_counts <- generate_kmers(rna_sequences, 6)

    # count heptamers in set of DNA sequences
    dna_sequences <- c(
      "CAACAGCCTTAATT", "CAGTCAAGACTCC", "CTTTGGGGAAT",
      "TCATTTTATTAAA", "AATTGGTGTCTGGATACTTCCCTGTACAT",
      "ATCAAATTA", "AGAT", "GACACTTAAAGATCCT",
      "TAGCATTAACTTAATG", "ATGGA", "GAAGAGTGCTCA",
      "ATAGAC", "AGTTC", "CCAGTAA",
      "TTATTTA", "ATCCTTTACA", "TTTTTTT", "TTTCATCATT",
      "CCACACAC", "CTCATTGGAG", "ACTTTGGGACA", "CAGGTCAGCA"
    )
    hexamer_counts <- generate_kmers(dna_sequences, 7)

[Package transite version 1.6.2 Index]