References, Perl

To install the Vienna RNA package, get the latest ViennaRNA-X.X. tar. gz file from www.tbi.univie.ac.al/RNA. The package can be installed in exactly the same way as RNAz, using. / configure and make. Please refer to the INSTALL document for detailed installation options. Make sure that the Perl programs in the Utils directory are in the PATH of executables. 

After the SQL statement is executed, an array reference is returned using fetchall arraryref. The individual rows from this array are then printed. Some care needs to be taken when using fetchall arrayref when a large number of rows are returned. In that case, not all rows may be returned and the function will need to be called again until all rows are returned. The documentation for the DBI perl module discusses this more fully.1... 

This will—and should—look strange at first. The numeral in the square brackets, [ 2 ], is the index. Perl numbers its arrays starting with zero, so the first item is actually index 0, the second item is index 1, and the third item is index 2. Any expression can be placed within the square brackets, as long as that expression ultimately evaluates to an integer. As an example, if a scalar variable i contains a number, to address the next element in the series, it could be referred to as clones [ i-l-1 ]. More mystifying, however, is the at the beginning of the array name. What happened to clones ... 

Perl has many featines that caimot be covered in a single chapter. For example, subroutines allow one to define customized functions that take arguments and retimi a result. References allow sophisticated data structures such as lists of lists to be created. Objects allow large, complex programs to be written so that code can be reused in different contexts. Pipes and processes allow for the control of external programs, perhaps to create an automated pipeline invoking commonly used programs. 

Common Gateway Interface. Gommon Gateway Interface (GGl) is used to write programs that interact with Web pages to process information a person types into a form for registration, credit card purchase, or search on a Web site. GGl is a tool that functions as an interfece between code written in Perl (Practical Extraction and Report Language) and a Web server. These GGl applications are referred to... 

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