20170519 class lecture note

2017.05.19 Bioinformatics class lecture note.

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Topic : Bioprogramming

> Today, we mainly talk about definition of bioprogramming, some Perl functions and 'grammar'.

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1. Some Perl functions

• #!/usr/bin/perl : As the Perl is a program, we need to load to use it. This code meens load and make a new script.
• use : A calling function. We also need some 'rules' for using and handling codes, so by use 'use' function, load the set of rules.
  • ex) use strict / warning
  • At the above codes, 'strict' and 'warning' are  'library'; by definition of the professor, it's 'a set of books', but in the programming, 'a set of rules' for handling the Perl program comfortably.
• my* : Function restricting a boundary of a section. Computer has memory divided as sections, and when we use the function, we can make or define a variable's boundary.
  • ex ) my $Bioinformatics
• Also there are some types of variables.
  • @ : array ( sets in a box; the 'a' means 'array' and a circle surrounding 'a' means box. It's easy to understand when imagining the mathematical array form.)
    • ex) ( 1, 2, 3, ... )
  • % : hash ( divided key and value. A circle is a key and the another is a value.)
    • ex) ( 1, 2 / 3, 4 / .... )
  • $ : scaler ( just simply, one unit. 'S' means the name 'Scaler' and the bar means 'one'.)
    • ex) 1, 2, 3 ....
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