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POStoring the output of a function into a variable in R
 

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    <p>I'm having trouble with storing the output of a function into a variable. I think it's best that I give some context to the problem I'm trying to work out. Suppose that players "a" and "r" play a game of tennis, the runningScoreFn sums the pointHistory vector and puts everything together in a nice data.frame</p> <pre><code>runningScoreFn = function(pointHistory){ playerUni = c("a", "r") cols = sapply(playerUni, function(thisPlayer){ cumsum(pointHistory == thisPlayer) }) names(cols) = playerUni cbind(pointHistory, as.data.frame(cols)) } </code></pre> <p>The oneEpxiermentGameFn that plays out a game of "a" v.s "r".The first player to win 4 points wins the game, but he must be ahead by at least 2 points. "r" has 60% chance of winning a point.</p> <pre><code>pRogerPoint = 0.6 oneExperimentGameFn = function(pRogerPoint){ game = c(rep("r",pRogerPoint * 100), rep("a", 100-pRogerPoint*100)) i = 4 keepGoing = TRUE while(keepGoing){ whosePoint = sample(game, size=i, replace=TRUE) if(sum(whosePoint=="r")-sum(whosePoint=="a")&gt;=2){ success = TRUE print(cbind(runningScoreFn(whosePoint),success=success)) keepGoing = FALSE }else if(sum(whosePoint=="a")-sum(whosePoint=="r")&gt;=2){ success = FALSE print(cbind(runningScoreFn(whosePoint),success=success)) keepGoing = FALSE } i=i+1 } } </code></pre> <p>pRogerGameFn shows the probability that Roger wins the game. </p> <pre><code>pRogerGameFn = function(pRogerPoint, NExperiments){ RogerGameFn = lapply(1:NExperiments,function(dummy){ ok=oneExperimentGameFn(pRogerPoint) })} </code></pre> <p>Here I wish to store the output into the variable ok, but ok returns NULL. I think this has something to do with my oneExperimentGameFn. I also tried ok = RogerGameFn, but ok also returns NULL. </p>
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