R/kstructure_is_kspace.R

In kst: Knowledge Space Theory

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### kstructure_is_kspace.R
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### dependencies: library(sets)
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### 2008-04-24: created
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kstructure_is_kspace <- function(x) {

   ### check x
   if (!inherits(x, "kstructure")) {
      stop(sprintf("%s must be of class %s.", dQuote("x"), dQuote("kstructure")))
   }

   ### check for space
   y <- inherits(x, "kspace") || length(x)==length(kspace(x))

   ### return results
   y
}