[BioC] IRanges problem: ranges (overlap (range.1, range.2)) does not seem to work

[Paul Shannon]

Reading in ?RangesMatching-class  that

   'To get the actual regions of intersection between the overlapping  
ranges, use the 'ranges' accessor'

But in my possibly naive or mistaken use, it does not seem to work:


     range.1 = IRanges (start = c (10, 20), end = c (15, 23))
     range.2 = IRanges (start = c (13, 19), end = c (18, 25))
     overlap.12 = overlap (range.1, range.2)
     ranges (overlap.12)
        Error in is(query, "Ranges") :
          element 1 is empty;
          the part of the args list of 'class' being evaluated was:
          (object)

Any advice?  Thanks!

  - Paul


sessionInfo ()
R version 2.9.0 (2009-04-17)
x86_64-unknown-linux-gnu

locale:
LC_CTYPE 
= 
en_US 
.UTF 
-8 
;LC_NUMERIC 
= 
C 
;LC_TIME 
= 
en_US 
.UTF 
-8 
;LC_COLLATE 
= 
en_US 
.UTF 
-8 
;LC_MONETARY 
= 
C 
;LC_MESSAGES 
= 
en_US 
.UTF 
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;LC_PAPER 
= 
en_US 
.UTF 
-8 
;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_I\
DENTIFICATION=C

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

other attached packages:
[1] Biostrings_2.12.1 IRanges_1.2.2     RMySQL_0.7-4       
DBI_0.2-4         RUnit_0.4.22

loaded via a namespace (and not attached):
[1] Biobase_2.4.1 tools_2.9.0