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Experiment

2 replies on 1 page. Most recent reply: Jul 25, 2003 8:28 AM by David Smallwood

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David Smallwood

Posts: 2
Nickname: mudway
Registered: Jul, 2003

Experiment

Posted: Jul 25, 2003 4:54 AM

Dear Sirs/Madam

I have some experimental data in an ASCII file from which I'm trying to construct some hash tables from and then do some statistical analysis/calculations. This is for a scientific experiment. I have made an attempt at writing a simple parser by writing a class that reads data in from the file.

1) What I want to be able to do is parse this data so that it dynamically builds up a hash table with the key of the table being an id (i.e which is found in column 4 of the ascii file).

2) I want to be able to keep a tally/count for each individual ID (i.e. 4th column) the number of times a particular activity which is described by a string (i.e 7th column) occurs. I want to store this as a data value in a vector.

(I have code which parses the file. However, I want to count the number of times (i.e. frequency) a particluar ID does an activity and store this as a value in a vector under each appropriate activity.)

This is the format of the ASCII file:

13052003 11:30:18 82575 f40311bffb 331981 2.8 Paging response
13052003 11:30:22 82881 f41ae2d242 33 12.2 Normal location update+authentication
13052003 11:30:28 84594 f400551875 33 4.4 Periodic location update
13052003 11:30:54 90333 f49183d234 33 5.5 Periodic location update
13052003 11:30:56 90659 f489815398 33 5.5 Periodic location update
13052003 11:30:57 90996 2943016406401280 331981 1.1 Paging response
13052003 11:31:15 94815 f424a4ac13 331981 5.5 Paging response
13052003 11:32:23 109615 f47d005bd9 331981 1.7 Service request mobile call
13052003 11:32:27 110421 f465644163 331981 2.2 Service request mobile call
13052003 11:32:31 111237 f4689278c7 331981 11.6 Service request mobile call
13052003 11:32:55 116577 f447035857 335981 12.7 Service request mobile call
13052003 11:32:57 116796 2943012109009630 33 12.7 Normal location update+authentication
13052003 11:33:16 121080 f420061d94 331981 5.5 Paging response
13052003 11:34:28 136686 f48603ea6c 33 5.5 IMSI attach
13052003 11:34:33 137502 f41ff1b5bb 331981 3.3 Service request mobile call+authentication
13052003 11:35:07 145172 f486935fb4 331981 1.7 Paging response
13052003 11:35:15 146835 f44ab34924 33 2.2 Periodic location update

Column fields explained:-

column 1 is a Date value.
column 2 is a Time.
column 3 is a Frame Number.
column 4 is the ID e.g. 2943016406401280 or f40311bffb
column 5 is an Integer
Column 6 is a Float
Column 7 is a String for describing an Activity

In summary, what I want to end up with is a hash table that looks something like this which can be printed to the console:

ID IMSI Attach IMSI Detach Periodic location update Normal location update Serv. Req. M O Serv. Req. SMS

f4aed364b9 0 0 8 0 0 8
f49bb0f30f 0 0 43 0 0 0

I want to store these counts in vectors because I want to be able to do some calculations on this data later on. Any help much appreciated.

zenykx

Posts: 69
Nickname: zenykx
Registered: May, 2003

Re: Experiment

Posted: Jul 25, 2003 5:42 AM

If i understand well you want to use the column 4 string as a key of a HashMap, but in the same time these values are not unique (?). So, when a new line containing the same column 4 value will be reached the old value will be lost.
I dont really understand what is the problem. Create a class which contains as fields the columns in your test data, create pairs ID - class in your hashmap, put every string in column 7 in another hashmap in order to count the number of apparition and finally make your class display its contents in the format you want.

David Smallwood

Posts: 2
Nickname: mudway
Registered: Jul, 2003

Re: Experiment

Posted: Jul 25, 2003 8:28 AM

I understand what you mean. I want to keep a total of all the times the column 4 value does a particular activity e.g. f402f0e364 does IMSI Attach activity 0 times altogether in the file....

thanks.

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