| When you display the value of a trend and
it shows -1.#QNB it represents that it is an invalid or gated
value.
If this is not descriptive enough in your application or
otherwise, instead of directly displaying or using this value you
can pass it to the cicode function TrnIsValidValue() and it will
return with a number indicating if the value is valid, invalid or
gated.
You can then decide how to handle it. eg instead of displaying
the invalid value you may choose to place the text "invalid" which
would be more descriptive.
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