Hi all,

I got a bit lost trying to figure out why the following code does not work. The same code does work when type = 'any', 'start', 'end' or 'within', but not when type = 'equal'. When type = 'equal' it fails with one of the following:
## countOverlaps() error message
Error in queryHits(findOverlaps(query, subject, maxgap = maxgap, minoverlap = minoverlap,  : 
  error in evaluating the argument 'x' in selecting a method for function 'queryHits': Error in match.arg(type) : 
  'arg' should be one of “any”, “start”, “end”, “within”
## findOverlaps() and overlapsAny() error message
Error in match.arg(type) : 
  'arg' should be one of “any”, “start”, “end”, “within”

So 'equal' isn't a valid option for when the subject is a CollapsedVCF object, whereas it is a valid option for when the subject is, say, a GRanges object, correct?

Is it possible to extend findOverlaps(), countOverlaps() and overlapsAny() to allow for type = 'equal' when the subject is a CollapsedVCF object? Ideally this would also work if query and subject were both of CollapsedVCF class because I'm often interested in finding overlaps between two VCF files and I'd like to be able to do that with type = 'equal'.

Thanks
Peter Hickey

#### DESCRIPTION ####
# Peter Hickey
# 22/08/2013
# findOverlaps(), countOverlaps() and overlapsAny() don't work when `query` is a CollapsedVCF object, `subject` is a GRanges object and `type` is 'equal' yet they do work when `type` is 'any'.

#### Load packages ####
library(VariantAnnotation)

#### Create VCF ####
fl <- system.file("extdata", "ex2.vcf", package="VariantAnnotation") 
vcf <- readVcf(fl, "hg19")

#### Create GRanges object ####
gr <- GRanges(seqnames = '20', ranges = IRanges(start = 14370, end = 14370))

#### countOverlaps ####
countOverlaps(vcf, gr, type = 'any') # Works
countOverlaps(vcf, gr, type = 'equal') # Doesn't work
findOverlaps(vcf, gr, type = 'any') # Works
findOverlaps(vcf, gr, type = 'equal') # Doesn't work
overlapsAny(vcf, gr, type = 'any') # Works
overlapsAny(vcf, gr, type = 'equal') # Doesn't work

#### sessionInfo ####
sessionInfo()
R version 3.0.0 (2013-04-03)
Platform: x86_64-unknown-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=C                 LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] parallel  stats     graphics  grDevices utils     datasets  methods  
[8] base     

other attached packages:
[1] VariantAnnotation_1.6.7 Rsamtools_1.12.3        Biostrings_2.28.0      
[4] GenomicRanges_1.12.4    IRanges_1.18.3          BiocGenerics_0.6.0     

loaded via a namespace (and not attached):
 [1] AnnotationDbi_1.22.6   Biobase_2.20.1         biomaRt_2.16.0        
 [4] bitops_1.0-6           BSgenome_1.28.0        DBI_0.2-7             
 [7] GenomicFeatures_1.12.3 RCurl_1.95-4.1         RSQLite_0.11.4        
[10] rtracklayer_1.20.4     stats4_3.0.0           tools_3.0.0           
[13] XML_3.98-1.1           zlibbioc_1.6.0  




--------------------------------
Peter Hickey,
PhD Student/Research Assistant,
Bioinformatics Division,
Walter and Eliza Hall Institute of Medical Research,
1G Royal Parade, Parkville, Vic 3052, Australia.
Ph: +613 9345 2324

hickey@wehi.edu.au
http://www.wehi.edu.au


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