# PARAM, TRAKMTX

Bulk Data Entry Controls output of the mode tracking matrix during optimization.

Parameter Values Description
TRAKMTX <0, 1>
Defaults:
• The value of this parameter is 0 if it is not included in input file.
• If this parameter is included in the input file, but no value is provided, then running the program will result in an error.
TRAKMTX is a parameter that controls the output of the mode tracking matrix during optimization.
0 (Default)
The mode tracking matrix will not be printed to the output file.
1
The mode tracking matrix will be printed to the output file at each iteration.
The following example is of mode tracking matrix. For this example, assume that:
1. The first 5 modes are being tracked.
2. 10 modes are calculated for each analysis.
3. PARAM, MFILTER is set to 0.7.

Mode Tracking Matrix:

$\left[\begin{array}{cccccccccc}1.0& 0.2& 0.1& 0.0& 0.0& 0.0& 0.0& 0.0& 0.0& 0.0\\ 0.1& 0.7& 0.2& 0.1& 0.0& 0.0& 0.0& 0.0& 0.0& 0.0\\ 0.3& 0.2& 0.3& 0.7& 0.4& 0.2& 0.1& 0.0& 0.0& 0.0\\ 0.2& 0.1& 0.8& 0.4& 0.3& 0.1& 0.1& 0.0& 0.0& 0.0\\ 0.1& 0.2& 0.3& 0.4& 0.5& 0.4& 0.2& 0.1& 0.1& 0.1\end{array}\right]$

Based on the above matrix, Mode 1 (of the previous iteration) will get tracked to Mode 1 (of current iteration). Mode 2 will get tracked to Mode 2. Mode 3 will get tracked to Mode 4. Mode 4 will get tracked to Mode 3. Mode 5 could not be tracked to any of the 10 modes in the current iteration (out of bounds).