PARAM, TRAKMTX

Parameter

Values

Description

TRAKMTX

<0, 1>

Default = 0

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.

If TRAKMTX = 1
The mode tracking matrix will be printed to the output file at each iteration.

If TRAKMTX = 0
The mode tracking matrix will not be printed to the output file.

Note:

Each element of the mode tracking matrix stores the correlation value of two eigenvectors which is calculated using certain mode tracking criteria (see PARAM, TRAKMETH).

Example

The following is an example of the 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

param_trakmth

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).

Note:

PARAM, MODETRAK, YES or the subcase selector MODTRAK = YES should be added to the input file to activate mode tracking.