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

Xin wrote: 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.

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

Marc Moragues wrote: Xin jasonshi510 at hotmail.com writes: y-data[,7] x-data[,3] I want to know the mean of y if corresponding x=1. Try this: mean(data[data[,3]==1,data[,7]) Folks, please! 1. If you answer, please write at least syntactically valid code (look at your index

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

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?