filter_blast_hits: Filter blast hits
In cparsania/phyloR: Clean blast results for downstream phyloegentic analysis

Description Usage Arguments Value See Also Examples

Given a tbl of blast output format 7 hits can be filtered by evalue, bit_score, query_cov, identity and query_length

filter_blast_hits(
  blast_tbl,
  evalue = NULL,
  bit_score = NULL,
  query_cov = NULL,
  identity = NULL,
  query_length = NULL
)

`blast_tbl`	an object of class tbl from blast output format 7. It must contains below columns. query_acc_ver subject_acc_ver identity alignment_length mismatches gap_opens q_start q_end s_start s_end evalue bit_score positives Column names can be assigned using the function `get_blast_outformat_7_colnames()`
`evalue`	a numeric value; default NULL. Only hits having evalue <= than given will be retained.
`bit_score`	a numeric value; default NULL. Only hits having bit_score >= than given will be retained.
`query_cov`	a numeric value between 0 and 100 ; default NULL. Only hits having query_cov >= than given will be retained. query_cov will be calculated from the column `q_start` `q_end` and param `query_length`
`identity`	a numeric value between 0 and 100;default NULL. Only hits having identity >= than given will be retained.
`query_length`	a numeric value indicating length of query sequence.

a tbl of filtered blast hits.

get_blast_outformat_7_colnames

## Not run: 
 f <- system.file("extdata","blast_output_01.txt" ,package = "phyloR")
 d <- readr::read_delim(f, delim ="\t" , col_names = F , comment = "#")
 colnames(d) <- phyloR::get_blast_outformat_7_colnames()
 filtered <- filter_blast_hits(d ,
 query_cov = 90 ,
 identity = 40,
 query_length = 249,
 evalue = 1e-6)

## End(Not run)