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Perl module P669
Data Munging
Exercises, examples and other material relating to training module P669. This topic is presented on public course Perl for Larger Projects

Perl is a superb language for data manipulation. This module covers some of the more advanced features of the language which help give it this capability.

Related technical and longer articles
Data Monging

Articles and tips on this subjectupdated
4620Perl 6 - a Practical Extraction and Reporting example!
Always looking for an excuse to write little demo scripts - especially in Perl 6 which was new as an official release at Christmas, ... and had such an opportunity today. A datafile containing 2,500 records - station usage - and seeing how many were smaller in passenger numbers that Melksham in 2014 ...
2016-01-12
 
3764Shell, Awk, Perl of Python?
Very frequently, IT system users find they've got a data file in one format and they need to filter it and transform it. On Linux and Unix systems, utilities such as grep and cut were the tradtions, perhaps with some awk. Perl provided a single-program replacement for shell scripts that bolted together ...
2012-06-16
 
3707Converting codons via Amino Acids to Proteins in Perl
DNA is the code of life - a double helix, comprising just four different basic codon elements:   • Adenine (A)   • Thymine (T)   • Guanine (G)   • Cytosine (c) and a huge amount of work has gone into analysing these for the genes right across ...
2012-04-28
 
3335Practical Extraction and Reporting
The week just gone, I gave a Perl course in Edinburgh to a dozen very bright scientists, working in the bionformatics field, where they're concerned with analysing a veritable flood of data. A great deal of that analysis is fairly standard and so will be done using standard tools - some written in C ...
2011-06-26
(longer)
2702First and last match with Regular Expressions
Conventional Wisdom says that it's pointless to start a regular expression with ".*" or ".+", as this is implied within a match - regular expression matches are looking for strings that are contained anyway: '/abc/' - contains abc '/.*abc/' - contains anything or nothing, followed by abc However - ...
2010-04-02
 
2129Nothing beats Perl to solve a data manipulation requirement quickly
OK - I admit it. It might be slightly out of fashion but I still love Perl for that quick hack script which is a one-off data manipulation need. I have two files - the first containing records of who signed our pledge for an appropriate TransWilts train service last year, and another containing records ...
2009-04-16
 
1947Perl substitute - the e modifier
Here's a graphic illustration of the use of the "e" for "execute" modifier used on the end of substitute operation in Perl. The "s" for substitute allows you to replace a matched pattern with a STRING in which you can use special references like \1 or $1 for the first matched substring. If you want ...
2008-12-16
 
1509Extracting information from a file of records
Here's a very common application ... You file a file of data records, and you want to parse the file handing the data record by record. Each record has a series of space delimited fields, most of which are no interest to you what so ever ... And a template for a solution in Perl. open (FH,--put ...
2008-01-17
 
1316Filtering and altering Perl lists with grep and map
In Perl, you can process whole lists (arrays) in single operations - and that's very efficient at run time as it avoids the needs for loops, and the needed for Perl's Virtual Machine to go back to the byte code (in effect source) for each member. The map function applies an opertion to each member of ...
2007-08-23
 
597Storing a regular expression in a perl variable
When you match to a regular expression in a perl program, the program has to compile the regular expression (i.e. work out what it does) before actually doing the matching. It's pretty smart about that - it stored the result of than compile so that it only has to do it once during each run. However, ...
2006-06-05
 
Examples from our training material
anagram   Perl program to look for anagrams
bacon   Conversion Codons -> Amino Acids -> Protein
cdk.fasta   Data for sample bioinformatics program in Perl
filedata   List manipulation - sorting files by size and reporting largest 10
filedata2   Sorting files by size - shortened example, harder to follow?
memsave   Compressing data to save memory
new1   List iteration
new2   Alternative list iteration
oldfash   Handling an "arraY" - really a list - the oldfashioned way
pc1   (Somewhat) conventional programming methods to parse data
pc2   Using the power of lists to save code and time
pc3   Handling a file as a single string of text
Pictures
Examining the output of a Perl program
Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from [here].
Topics covered in this module
Iterating over data in Perl.
Processing data through regular expressions.
Compressing data.
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

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