Dear Mr.Dani,
Thank you very much for the reply. I understand that but question is not
clear. I will explain my problem little more.
Below is the sample of my data set. Actual data file is very much
larger.( about 3 GB)
Date Time Veh ID Longitude Latitude Speed Odometer
Route No
distance flag
2003/11/12 8:32:43 10 139.6368501 35.51527949 23.6
27406416 1 2177 3
2003/11/12 8:32:44 10 139.6368501 35.51527949 23.6
27406416 1 2177 3
2003/11/12 8:32:45 10 139.636606 35.51526727 27.6
27406436 1 2155 3
The Points A,B and C are defined. In other words, the coordinates of
these points are known.
I tried to attach a flag depending on the distance to the bus from the
origin of the route as follows:
if the distance from origin is 0 to 50, 0
if it is 50 to 2000, 1
if it is 2000 to 2070, 2
if it is 2070 to 5775 , 3
if 5775 to 5830 flag is 4.
Point A(origin) lies between 0-50
Point B(destination) lies between 5775-5830
Point C(turning to other route) lies between 2000-2070
If bus has gone from origin to destination we get a series of 0,1,2,3
and 4.
If bus is coming other direction, sequence is 4,3,2,1 and 0. I want to
separate these two data into two files. If it has turned at point C we
get sequence of 0,1 and 2 only. This data I don't need.
My problem is how to split this based on the flag I have already
attached.
Please apologize me for the long mail.
Kind regards,
Geetha
-----Original Message-----
From: D. Bolliger [mailto:[EMAIL PROTECTED]
Sent: Sunday, September 03, 2006 7:11 PM
To: beginners@perl.org
Subject: Re: Removing unnecessary data
Geetha Weerasooriya am Sonntag, 3. September 2006 08:19:
> Hi Dear all,
Hi Geetha Weerasooriya
> I have a data file for bus trajectories where bus location at each
> second along the route is given. The specified route for the bus is
from
> origin (Point A) to Destination (Point B) , but sometimes bus has
> changed the route at a point (Point C) in between A and B and has
gone
> in some other route. I want to remove these data lines relevant to A
> to C when the bus changes the route. In other words, I want to keep
only
> the data where bus had completed the trajectory from Point A to B.
>
> Can some one please help me? I am still new to perl.
It shurely can be done with perl, but I think you have to provide more
info so
somebody can help:
How does the data look and what's its meaning? (How can the points A/B/C
be
identified?)
What did you try so far?
Dani
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