[R] Error: missing value where TRUE/FALSE needed

From: Nicholas Crosbie <crosbienicholas_at_yahoo.com.au>
Date: Sun, 6 Jan 2008 17:16:15 +1100 (EST)

Can any explain the following error:

Error in if ((seedCount <= seedNumber) && (valueDiff > sup)) { :
  missing value where TRUE/FALSE needed

which I get upon running this script:

seedNumber <- 10
seeds <- array(dim = seedNumber)
seedCount <- 1

maxValue <- 100
sup <- maxValue / 2

fcsPar <- array(as.integer(rnorm(100, 50, 10)))

while (seedCount <= seedNumber) {
  for(k in 1:100) {
    valueDiff <- abs(fcsPar[k] - fcsPar[k+1])       if((seedCount <= seedNumber) && (valueDiff > sup)) { #error

        seeds[seedCount] <- fcsPar[k]
        seedCount <- seedCount + 1
       } 
     }

  sup <- sup / 2
}

many thanks.

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