By D. Curtis Jamison
Engaged on the belief that the reader has no formal education in programming, Perl Programming for Biologists demonstrates how Perl is used to resolve organic difficulties. each one bankruptcy opens with a suite of studying targets, offers a number of evaluate questions and self-study routines, and concludes with a bulleted precis of key issues. the writer accommodates various real-life examples through the textual content. Upon finishing the booklet, readers may be able to quick practice such initiatives as correcting habitual error in spreadsheets, scanning a Fasta series for each incidence of an EcoRI website, adapting different writers' scripts to one's personal reasons, and most crucial, writing reusableand maintainable scripts that spare the rote repetition of code.
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Extra info for Perl Programming for Biologists
So, in a Perl program, the above statement would cause $n to have the value of 5. Similarly, when you give the print function an array, Perl recognizes that you probably want to print the contents of each slot of the array, so the statement print @genes; produces the output CAPZA2TFECCFTRLOC51691LOC56311 In this case, however, we’d like to impose a little bit of grammar and structure to make the line readable. We can do that a couple ways. First, we can simply put the entire string into double quotes.
For example, you might end up computing the square root of several numbers in several different places when you’re writing a statistical program that does an analysis of variance calculation on your data. Fortunately, Perl has anticipated that and provided the sqrt() function, which can be used over and over. However, Perl is a relatively generic language, and not all instances where it would be useful to have a dedicated function have been anticipated. Therefore, Perl provides the subroutine as a generic mechanism to write reusable functions speciﬁc to your application.
Some people prefer to use the repeat-until construct because it makes the code read more like English. 5 Loop Exits One issue that is important in complex loops is the manner in which you handle errors. Sometimes a situation arises where continuing with the current code block is either unnecessary or undesirable. Perl provides a few functions that can be used to control loops from inside the code block. 1 Last Often a situation arises where an error condition makes continuing in the loop will lead to grave problems.