Real Values Check
Add the Real Values Check node () under a User Input node to force users to enter real values for the input. An error message notifies the user that an illegal value was entered. The Settings window has the following section:
Bounds
From the Use min value and Use max value lists, choose one of the following bounds:
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 Unbounded (the default).
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 Open bound (<) or Open bound (>): Use a minimum value or maximum value that is smaller than the value in the Min value field or larger than the value in the Max value field, respectively.
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 Closed bound (<=) or Closed bound (>=): Use a minimum value or maximum value that is smaller than or equal to the value in the Min value field or larger than or equal to the value in the Max value field, respectively.