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copied!<p>perhaps you need <code>ifelse</code>? </p> <pre><code>teams <- c("Arizona", "Oregon", "Colorado") data$conf <- ifelse(data$team %in% teams & data$year == 2011, "Pac-12", "something else") </code></pre> <hr> <p><em>Edit</em></p> <p>You can change things by subsetting as @Simplefish has shown you if you don't want the <code>if</code>. Although your question does ask for <code>if</code>s. </p> <p>The other way is to do all the changes at once so you dont overcopy the answers. You could nest your <code>if</code>s like:</p> <pre><code>ifelse(data$team %in% teams & data$year == 2011, "Pac-12", ifelse(data$team %in% "Oklahoma" & data$year == 2008, "second answer", "third answer")) </code></pre> <p>But with lots of conditions this is cumbersome so maybe you want:</p> <pre><code>reference <- matrix(c(rep("Pac-12",3),rep("third answer",4), "Second Answer",rep("fourth answer",8)), 4, 4, dimnames=list(c("Arizona","Oregon", "Colorado", "Oklahoma"), c("2011","2008","2006","2005") ) ) #> reference # 2011 2008 2006 2005 #Arizona "Pac-12" "third answer" "fourth answer" "fourth answer" #Oregon "Pac-12" "third answer" "fourth answer" "fourth answer" #Colorado "Pac-12" "third answer" "fourth answer" "fourth answer" #Oklahoma "third answer" "Second Answer" "fourth answer" "fourth answer" data$conf <- with( data, reference [ cbind(team,year) ] ) # > data # team year conf #1 Arizona 2006 fourth answer #2 Arizona 2006 fourth answer #3 Arizona 2011 Pac-12 #4 Oregon 2011 Pac-12 #5 Oklahoma 2008 Second Answer #6 Colorado 2005 fourth answer #7 Colorado 2005 fourth answer #8 Colorado 2011 Pac-12 </code></pre> <p>A final way would be to <code>merge</code> things using a data.frame version of reference.....I'm sure someone else might demonstrate this.</p>

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