[Bioc-devel] Problem with merge

[Zhu, Julie]

Dear developers,

I encountered a strange merge problem and hope you can help me to understand
why this is happening and how to resolve it.

r3 and z1 are both data frames produced inside a function, when I try to
merge these two (R.2.10 and R.2.11),  chr 1 [19000000, 19000300], chr1
[30000000, 30000300] and chr2 [  100000,   100300] in r3 failed to merge
with the corresponding rows in z1. Is this related to the precision on auto
conversion of character to numeric? Thanks so much for your help in advance!

r3 
  feature_id name  chr  PeakLoc peakStart  peakEnd start_position
end_position strand FeatureLoc
1          1    1 chr1  2000160   2000010  2000310        1000000
2000000      +    1000000
2          2    2 chr1 19000150  19000000 19000300       10000000
20000000      -   20000000
3          2    3 chr1 30000150  30000000 30000300       10000000
20000000      -   20000000
4          4    4 chr2      450       300      600           1000
5000      +       1000
5          5    5 chr2     5650      5500     5800           6000
7000      -       7000
6          6    6 chr2   100150    100000   100300          10000
15000      +      10000

z1
     name chr    peakStart  peakEnd    PeakLoc
[1,] "1"  "chr1" "2000010"  "2000310"  "2000160"
[2,] "2"  "chr1" "19000000" "19000300" "19000150"
[3,] "3"  "chr1" "30000000" "30000300" "30000150"
[4,] "4"  "chr2" "300"      "600"      "450"
[5,] "5"  "chr2" "5500"     "5800"     "5650"
[6,] "6"  "chr2" "100000"   "100300"   "100150"

Best regards,

Julie

*******************************************
Lihua Julie Zhu, Ph.D
Research Associate Professor
Program in Gene Function and Expression
Program in Molecular Medicine
University of Massachusetts Medical School
364 Plantation Street, Room 613
Worcester, MA 01605
508-856-5256
http://www.umassmed.edu/pgfe/faculty/zhu.cfm