The HasRule( descriptor ) command returns true if descriptor is the name of a rule available for use by ScientificErrorAnalysis.  Otherwise, it returns false.

For more information on predefined rules in ScientificErrorAnalysis, see Predefined Rounding Rules.

$\mathrm{with}\left(\mathrm{ScientificErrorAnalysis}\right)\:$

$\mathrm{HasRule}\left(\mathrm{round}\right)$

$\mathrm{true}$

$\mathrm{HasRule}\left(\mathrm{round2}\right)$

$\mathrm{false}$