[R] how to read data from table based a condition

From: Xin <jasonshi510_at_hotmail.com>
Date: Thu, 10 Apr 2008 09:57:10 +0100


Dear All:

    I imported a table into R. But I want to read a variable (y) from this table conditional on another variable (x=1) in the table.

y<-data[,7]
x<-data[,3]

I want to know the mean of y if corresponding x=1.

I tried

if (x==1) y3<-y

It does not work.

Anyone can give a help?

Thanks!

Xin

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