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shall
2011 Jul 07
1
Substring a column vector
How to substring the following vector (in data frame b)
>b
a
11
12
1234
1245
124567
126786
145769
such that:
a1??? a2
1???? 1
1???? 2
12??? 23
12??? 34
124?? 567
126???787
145???769 ?
I tried logical commands with substr() did not work out.