[R] for loop and if problem

[Sake]

Hi,

I'm heaving difficulties with a dataset containing gene names and positions
of those genes.
Not such a big problem, but each gene has multiple exons so it's hard to say
where de gene starts and where it ends. I want the starting and ending
position of each gene in my dataset.
Attached is the dataset:
http://www.nabble.com/file/p21312449/genlistchrompos.csv genlistchrompos.csv 
Column 'B' is the gene name, 'G' is the starting position and 'H' is the
stop position.
You can load the dataset by using: data<-read.csv("genlistchrompos.csv",
sep=";")
I hope someone can help me, it's giving me headaches for a week now:-((.

Thanks! 

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