Saving data about the convergence of the dynamic assignment to a file

You can save the results of a dynamic assignment in a convergence evaluation file *.cva.

Note: The evaluation can be performed only with the add-on module Dynamic Assignment.

The file contains, for each time interval, the distribution of changes in volume and travel time for all edges and paths, the number of edges/paths that were traversed in this iteration for the first time, the share of edges/paths in percent which have met the convergence criterion as well as the info whether the simulation run has converged or not (Showing data about paths of dynamic assignment in lists).

Volume changes and travel time changes are divided into classes:

• 10 volume classes for volume changes
• 14 travel time classes for travel time changes

The number of paths and edges is output for each class for which changes have arisen in terms of volume or travel time. This data can be used to determine whether the dynamic assignment has converged (Using dynamic assignment).

You can save only aggregated data in ASCII format as a file *.cva.

Note: The name of the evaluation file contains the index of the simulation run in the following cases: if Vissim is started with the command line parameter -s <n> if the simulation run is started via the COM interface and RunIndex is set to a value > 0

1.  From the Evaluation menu, choose > Configuration > Direct Output tab.

2.  In the Convergence row, select the option Write to file.

3.  Confirm with OK.

4.  Start the simulation (Running a simulation).

A *.cva file is saved.

Result of convergence evaluation

A convergence evaluation file *.cva contains the following data:

Element	Description
File title	Name of evaluation
File	Path and name of network file
Comment	Optional comment from the simulation parameters
Date	Time of evaluation
Vissim	Version number, service pack number, build number
Data block	The results of the convergence evaluation are displayed in a table which compares the volumes and travel times of all edges and paths for each iteration. The table is divided into the following blocks: Volume difference All edges, except closed edges All paths, except detours Travel time difference: Edges: Only the edges used during the last simulation run Paths: Only the paths used during the last simulation run Shares: Shares in percent: of the converged paths ShrConvPathTT. Paths without volume in all time intervals of the current simulation run are not taken into account. of the converged edges (after travel time) ShrConvEdgeTT of the converged edges (after volume) ShrConvEdgeVol The fulfilment of the convergence condition AssignConv is indicated by a + or -.
	Each row of the evaluation blocks refers to a time interval: For example, 600.0; 1,200.0; means the interval from simulation second 600 to 1,200. For each column, each row contains the number of edges and/or number of paths that are contained in the respective class (intervals of volume difference and intervals of travel time difference). The class boundaries Class from and Class to are contained in the header of a block. Class to belongs to the interval. For example, Class from 3 to 5 for edges means: all edges with volume changes greater than 3 vehicles and up to and including 5 vehicles are contained in this class. In the example below, the value 7 is for the time interval 0-600. ShrConvPathTT: The share of the paths in percent which have met the convergence criterion if the convergence criterion Travel time on paths has been selected. WghtShrConvPathTT: The percentage weighted by volume Total volume (across all time intervals) of all converged paths / total volume of all paths used in the current simulation run ShrConvEdgeTT: The share of the edges in percent which have met the convergence criterion if the convergence criterion Travel time of edges has been selected. Edges without volume in all time intervals of the current simulation run are not taken into account. WghtShrConvEdgeTT: The percentage weighted by volume Total volume (across all time intervals) of all converged edges / total volume of all edges used in the current simulation run ShrConvEdgeVol: The share of the edges in percent which have met the convergence criterion if the convergence criterion Volume on edges has been selected. Vissim considers all edges that are not closed and are not below the minimum length. AssignConv: The simulation run has converged (+), has not converged (-) Column New: edges/paths entered for the first time in this iteration

Example of convergence evaluation: file *.cva

Convergence evaluation

File:C:\Users\Public\Documents\PTV Vision\2024\Examples Training\Dynamic Assignment\Detour\Detour.inpx

ID:  Dynamic Assignment routing example

Date:   03.01.2023 10:33:29

PTV Vissim 2024.00-00* [253691]

From time;   To time; Volume difference;

(Class from) ;; 0;  1;  3;    6;   11;   26;   51;   101;   251;   501;

(Class to) ;; 0;  2;  5;   10;   25;   50;  100;   250;   500;   ~;

Edges:

0.0;       300.0;    1;   3;   5;   9;   5;   0;   0;   0;   0;   0;

300.0;     600.0;    0;   2;   4;   8;   8;   1;   0;   0;   0;   0;

600.0;     900.0;    3;   6;   8;   4;   2;   0;   0;   0;   0;   0;

900.0;    1200.0;   23;   0;   0;   0;   0;   0;   0;   0;   0;   0;

1200.0;   1500.0;   23;   0;   0;   0;   0;   0;   0;   0;   0;   0;

1500.0;   1800.0;   23;   0;   0;   0;   0;   0;   0;   0;   0;   0;

1800.0;   2100.0;   23;   0;   0;   0;   0;   0;   0;   0;   0;   0;

2100.0;   2400.0;   23;   0;   0;   0;   0;   0;   0;   0;   0;   0;

2400.0;   2700.0;   23;   0;   0;   0;   0;   0;   0;   0;   0;   0;

2700.0;   3000.0;   23;   0;   0;   0;   0;   0;   0;   0;   0;   0;

3000.0;   3300.0;   23;   0;   0;   0;   0;   0;   0;   0;   0;   0;

3300.0;   3600.0;   23;   0;   0;   0;   0;   0;   0;   0;   0;   0;

Paths:

0.0;       300.0;    0;   1;   4;   7;   0;   0;   0;   0;   0;   0;

300.0;     600.0;    2;   3;   2;   3;   2;   0;   0;   0;   0;   0;

600.0;     900.0;   12;   0;   0;   0;   0;   0;   0;   0;   0;   0;

900.0;    1200.0;   12;   0;   0;   0;   0;   0;   0;   0;   0;   0;

1200.0;   1500.0;   12;   0;   0;   0;   0;   0;   0;   0;   0;   0;

1500.0;   1800.0;   12;   0;   0;   0;   0;   0;   0;   0;   0;   0;

1800.0;   2100.0;   12;   0;   0;   0;   0;   0;   0;   0;   0;   0;

2100.0;   2400.0;   12;   0;   0;   0;   0;   0;   0;   0;   0;   0;

2400.0;   2700.0;   12;   0;   0;   0;   0;   0;   0;   0;   0;   0;

2700.0;   3000.0;   12;   0;   0;   0;   0;   0;   0;   0;   0;   0;

3000.0;   3300.0;   12;   0;   0;   0;   0;   0;   0;   0;   0;   0;

3300.0;   3600.0;   12;   0;   0;   0;   0;   0;   0;   0;   0;   0;

From time;   To time; Travel time difference;

(Class from);;0%; 5%;10%;15%; 20%; 30%; 40%; 50%; 60%; 70%; 80%;  90%; 100%; 200%;

(Class to);;5%;10%;15% 20%; 30%; 40%; 50%; 60%; 70%; 80%; 90%; 100%; 200%; ~; New;

Edges:

0.0;     300.0; 8; 6; 6; 0; 3; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

300.0;   600.0; 5; 2; 6; 4; 3; 1; 0; 1; 1; 0; 0; 0; 0; 0; 0;

600.0;   900.0; 8; 5; 2; 2; 2; 1; 2; 0; 0; 1; 0; 0; 0; 0; 0;

900.0;  1200.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

1200.0; 1500.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

1500.0; 1800.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

1800.0; 2100.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

2100.0; 2400.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

2400.0; 2700.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

2700.0; 3000.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

3000.0; 3300.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

3300.0; 3600.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

Paths:

0.0;     300.0; 6; 2; 3; 1; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

300.0;   600.0; 4; 2; 3; 0; 2; 1; 0; 0; 0; 0; 0; 0; 0; 0; 0;

600.0;   900.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

900.0;  1200.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

1200.0; 1500.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

1500.0; 1800.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

1800.0; 2100.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

2100.0; 2400.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

2400.0; 2700.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

2700.0; 3000.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

3000.0; 3300.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

3300.0; 3600.0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;

ShrConvPathTT; WghtShrConvPathTT; ShrConvEdgeTT; WghtShrConvEdgeTT; ShrConvEdgeVol; AssignConv;

       75.00%;           75.63%;         43.48%; weighted: 43.88%;         65.22%;        -;