[R] Logical operators

[Patrick Hausmann]

Hello,

I have a csv-file which looks like:

#### pwt6_r.csv ####
code;year;rgdpch
AGO;1998;1234
ALB;1998;3576
ARG;1998;#NA
SVN;1996;13439
SWE;1996;21492
AGO;1960;#NA
ALB;1960;2345
ARG;1960;4634
#### pwt6_r.csv ####

To import this file i call:
pwt6<-read.csv("d:/pwt6_r.csv",header=T,na.strings="#NA",sep=";")

Now I want to generate a new data.frame which include only 
+ observations for the years 1960 and 1998
+ where the variable 'rgdpch' has no missing values.

The result should be:

code;year;rgdpch
ALB;1998;3576
ALB;1960;2345

I tried to solve this with logical operators (==), but without any 
success.

Thanks for your help!
Patrick
-------------
Patrick Hausmann
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Tel. +49 421 5980631 - Fax. +49 421 5980632
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