# PARAM, DFREQ

Bulk Data Entry Used to determine duplicate frequencies.

Parameter Values Description
DFREQ <Real>

Default = 10-5

DFREQ specified the threshold for the elimination of duplicate frequencies on all FREQi Bulk Data Entries. ${f}_{N}$ and ${f}_{N-1}$ are considered duplicated if:
$|{f}_{N}-{f}_{N-1}|<\mathit{DFREQ}*|{f}_{\mathit{MAX}}-{f}_{\mathit{MIN}}|$

Where, ${f}_{\mathit{MAX}}$ and ${f}_{\mathit{MIN}}$ are the maximum and minimum excitation frequencies of the combined FREQi entries.