PERL Ð HASHES
10th February 2011


1) Use the data below to create a file example1.csv, Assimilate the data into a hash to answer the questions below:

	antonia,Perl.XML,PHP,Tcl/Tk,MySQL
	barbara,Tcl/Tk,ASP,Ruby,Java
	cherry,Perl,Java,Ruby,MySQL
	delia,XML,PHP,Java,ASP
	ethel,MySQL,Perl,Tcl/Tk,ASP
	florence,Ruby,PHP,Java,ASP
	gloria,XML,Perl,Tcl/Tk,MySQL
	hazel,PHP,Python,Perl,Ruby,ASP
	iris,Perl,MySQL,Java,Tcl/Tk
	jenny,XML,Perl,Ruby,ASP
	kerry,Perl,Tcl/Tk,Ruby,MySQL
	leane,PHP,Python,ASP,Perl,Java
	margaret,XML,Perl,Ruby,MySQL,Tcl/Tk
	nina,Tcl/Tk,Perl,ASP,Ruby
	olivia,MySQL,Python,ASP,PHP
	petra,XML,Tcl/Tk,ASP,Perl,Ruby
	queenie,Ruby,Perl,ASP,MySQL
	rita,PHP,ASP,Ruby,Perl
	sally,Tcl/Tk,Perl,XML,MySQL
	tina,Tcl/Tk,Ruby,Java
	uva,MySQL,Perl,Java,PHP
	venus,Java,Perl,Ruby,ASP
	wendy,Perl,Tcl/Tk,ASP,MySQL
	xena,Java,Perl,PHP,ASP,XML
	yollanda,Ruby,MySQL,Tcl/Tk
	zoe,Ruby,ASP,Perl,PHP
	adam,Tcl/Tk,Perl,Python,MySQL
	barry,Python,XML,Java,Perl,PHP
	charles,Perl,Ruby,MySQL,Tcl/Tk
	david,Perl,Tcl/Tk,Java
	ed,Ruby,Perl,Java,PHP
	fred,MySQL,Perl,Java,XML

	Using the hash created above answer the following:
	a) Print out all the names of programmers in alphabetical order
	b) How many programming languages are known within the group.
	c) Enumerate the number of programmers who can program each of the programming 	languages mentioned.
	d) Create a team of programmers who can code in Java, MySQL, PHP and XML.
	e) Obtain statistics about the usage of programming languages within this group e.g. java is 	used by 70% of programmers in this group, PHP by 20% and so on. 


2) Write a program to print out the a,t,c and g percentage within each of the 20th to 40th sequences in the file /home/afedorov/EID/Human37/hs37.intEID in intron.

3) Write a program that searches for a user entered gene name through the command line. Get the genes from the file in question 2. Make a hash of all the genes (key=name, value=gene ID or sequence).  

4) Write a program that will ask the user for a given name and report the corresponding family name. Use the names of people you know, or (if you spend so much time on the computer that you don't know any actual people) use the following table: 

Input 
Output 
fred 
flintstone 
barney 
rubble 
wilma 
flintstone

5) Write a script that reads a FASTA file (as an example you may use file in question 2) and stores the first 20 characters of the sequences in a hash. The gene name and intron number should be the keys and the 20 characters of the sequence should be the value. Now ask the user for a gene name and intron number and extract the sequence from the hash. If such an intron or gene name does'nt exist then print an error message.