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Text File  |  1991-08-19  |  339b  |  20 lines
  1. > watch(off)
  2. > a = 1
  3. > z = 1
  4. > vdelete(z)
  5. > if vdefined(a) == TRUE
  6. > message('variable "a" DOES exist')
  7. > else
  8. > message('variable "a" DOES NOT exist')
  9. > endif
  10. > if vdefined(z) == TRUE
  11. > message('variable "z" DOES exist')
  12. > else
  13. > message('variable "z" DOES NOT exist')
  14. > endif
  15. > watch(on)
  16. > timeout = 0
  17. > wait()
  18. > end
  19.  
  20.