[R] Fill vector more efficient than element by element?

[beatleb]

Dear R useRs,

I am a newbie. Currently, my script is quick long, therefor I am trying to
improve the efficiency of my script. 
I use often a version of the following code, the script below is just a
simple example, but I especially try to improve the last three lines:

matrix1<-diag(100)
a=2

try<-rep(0,10)
for (i in 1:10){
try[i]<-(matrix1[a*(i+5),7]+matrix1[a*(i+7),8]-matrix1[a*(i+8),9])/matrix1[a*(i+6),a*(i+6)]}

Is it possible to obtain the same result, but more efficient? 

Thank you! 

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