## Using gawk to Get PT Unassigned Trips Output into a Matrix

In the process of quality-control checking a transit on-board survey, one task that has been routinely mentioned on things like TMIP webinars is to assign your transit trip-table from your transit on-board survey.  This serves two purposes - to check the survey and to check the transit network.

PT (and TranPlan's LOAD TRANSIT NETWORK, and probably TRNBUILD, too) will attempt to assign all trips.  Trips that are not assigned are output into the print file.  In PT (what this post will focus on), will output a line similar to this:

 W(742): 1 Trips for I=211 to J=277, but no path for UserClass 1. 

When a transit path is not found.  With a transit on-board survey, there may be a lot of these.  Therefore, less time spent writing code to parse them, the better.

To get this to a file that is easier to parse, start with your transit script, and add the following line near the top:

 GLOBAL PAGEHEIGHT=32767 

This removes the page headers. I had originally tried this with page headers in the print file, but it created problems. Really, you probably won't print this anyway, so removing the page headers is probably a Godsend to you!

Then, open a command line, and type the following:

gawk '/(W.*)\./ {print $2,$5,$7}' TCPTR00A.PRN >UnassignedTransitTrips.PRN  Note that TCPTR00A.PRN is the transit assignment step print file, and UnassignedTransitTrips.PRN is the destination file. The {print$2,$5,$7} tells gawk to print the second, fifth, and seventh columns. Gawk figures out the columns itself based on spaces in the lines. The >UnassignedTransitTrips.PRN directs the output to that file, instead of listing it on the screen.

The UnassignedTransitTrips.PRN file should include something like:

 1 I=3 J=285, 1 I=3 J=289, 1 I=3 J=292, 1 I=6 J=227, 1 I=7 J=1275, 

The first column is the number of unassigned trips, the second column is the I zone, and the last column is the J zone.

This file can then be brought into two Matrix steps to move it to a matrix. The first step should include the following code:

RUN PGM=MATRIX PRNFILE="S:\USER\ROHNE\PROJECTS\TRANSIT OB SURVEY\TRAVELMODEL\MODEL\TCMAT00A.PRN"
FILEO RECO[1] = "S:\User\Rohne\Projects\Transit OB Survey\TravelModel\Model\Outputs\UnassignedAM.DBF",
FIELDS=IZ,JZ,V
FILEI RECI = "S:\User\Rohne\Projects\Transit OB Survey\TravelModel\Model\UnassignedTransitTrips.PRN"

RO.V=RECI.NFIELD[1]
RO.IZ=SUBSTR(RECI.CFIELD[2],3,STRLEN(RECI.CFIELD[2])-2)
RO.JZ=SUBSTR(RECI.CFIELD[3],3,STRLEN(RECI.CFIELD[3])-2)
WRITE RECO=1

ENDRUN


This first step parses the I=, J=, and comma out of the file and inserts the I, J, and number of trips into a DBF file. This is naturally sorted by I then J because of the way PT works and because I am only using one user class in this case.

The second Matrix step is below:

RUN PGM=MATRIX
FILEO MATO[1] = "S:\User\Rohne\Projects\Transit OB Survey\TravelModel\Model\Outputs\UnassignedAM.MAT" MO=1
FILEI MATI[1] = "S:\User\Rohne\Projects\Transit OB Survey\TravelModel\Model\Outputs\UnassignedAM.DBF" PATTERN=IJM:V FIELDS=IZ,JZ,0,V

PAR ZONES=2425

MW[1]=MI.1.1
ENDRUN


This step simply reads the DBF file and puts it into a matrix.

At this point, you can easily draw desire lines to show the unassigned survey trips. Hopefully it looks better than mine!

Tags: , , , , , , , ,