[R] HOW TO FILTER DATA

Saptorshee Kanto Chakraborty chkstr at unife.it
Wed Jan 3 20:53:08 CET 2018


Hello,

I have a data of Patents from OECD in delimited text format with IPC being
one column, I want to filter the data by selecting only certain IPC in that
column and delete other rows which do not have my required IPCs. Please,
can anybody guide me doing it, also the IPC codes are string variables.

The data is somewhat like below, but its a huge dataset containing more
than 11 million rows


Appln_id|Prio_Year|App_year|IPC
1|1999|2000|H04Q007/32
1|1999|2000|G06K019/077
1|1999|2000|H01R012/18
1|1999|2000|G06K017/00
1|1999|2000|H04M001/2745
1|1999|2000|G06K007/00
1|1999|2000|H04M001/02
1|1999|2000|H04M001/275
2|1991|1992|C12N015/62
2|1991|1992|C12N015/09
2|1991|1992|C07K019/00
2|1991|1992|C07K016/26



Thanking You

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