The following links are related to quantum mechanics and physics. To run it, you will need Java 1. Tell the browser to open it with javaws. This application displays the wave functions, probability densities and wave packets for various barriers, and is fully configurable. It also has links to a large collection of scientific applets. The program uses Numerov's Method to find a solution to the Schrodinger equation for the one-dimensional harmonic oscillator. This problem has an exact solution, and so the Numerov method is not really necessary to solve it.
The purpose of this program is to demonstrate how to use the method. Because it is exactly solvable, the results of the program can be validated easily against the analytical solution. This version requires the user to supply successive guesses of the energy eigenvalue. The first step in using it is to read the code, which contains instructions on how to compile it and how to run it.
It has built in help, and runs only in command line mode it does not have a GUI. It outputs an array of values of the solution to the Schrodinger equation. In other words, if psi x is the solution, then the output of the program is a sequence of values, psi 0psi 1psi 2This array can be copied into a spreadsheet and plotted.
The program is easily modified to use a binary search to hone in on the eigenvalue. This version has been tested on Fedora 8 and on Windows XP.
It should run on most any platform. Applications SSH Client 3. C has been invoked on it. Lab Info. How often have you wanted to rename all of the files in a given directory in some uniform way, such as to add a prefix or suffix to each name, or replace blanks in names of files you got from some Windows system by underscores?
What about replacing parts of the names of files?Perl is a general-purpose, high level interpreted and dynamic programming language. It was developed by Larry Wall, in Perl supports both the procedural and Object-Oriented programming.
Evolution of Perl :. It all started when Larry Wall was working on a task to generate the reports from a lot of text files which have cross-references. Then he started to use awk for this task but soon he found that it is not sufficient for this task.
So instead of writing a utility for this task, he wrote a new language i. Perl and also wrote the interpreter for it. At the beginning level, Perl was developed only for the system management and text handling but in later versions, Perl got the ability to handle regular expressions, and network sockets etc.
In present Perl is popular for its ability to handling the Regex Regular Expressions. The first version of Perl was 1.Toad license key
The latest version of Perl is 5. Perl 6 is different from Perl 5 because it is a fully object-oriented reimplementation of Perl 5. Why Perl? Perl has many reasons for being popular and in demand. Few of the reasons are mentioned below:. Since the Perl is a lot similar to other widely used languages syntactically, it is easier to code and learn in Perl. After writing the program save the file with the extension.
Comments: Comments are used for enhancing the readability of the code. The interpreter will ignore the comment entries and does not execute them.Check out what is new, what known issues there are, and frequently asked questions about this version of Strawberry Perl. As always, you're encouraged to tell us what you think. New perl core 5.
ID Distribution Version Note 1. Algorithm-C3 0. Algorithm-Diff 1. Alien-Build 2. Alien-GMP 1. Alien-Libxml2 0. App-cpanminus 1. App-local-lib-Win32Helper 0. App-module-version 1. App-pmuninstall 0. AppConfig 1. Archive-Extract 0. Archive-Tar 2. Archive-Zip 1. Authen-SASL 2.
B-COW 0. B-Hooks-EndOfScope 0. B-Hooks-OP-Check 0. B-Lint 1. B-Utils 0. BerkeleyDB 0. Bytes-Random-Secure 0. Canary-Stability Capture-Tiny 0. Carp-Always 0. Carp-Clan 6. CGI 4. Class-Accessor 0. Class-Accessor-Grouped 0. Class-Accessor-Lite 0. Class-C3 0.
Class-C3-Componentised 1. Class-Data-Inheritable 0. Class-ErrorHandler 0. Class-Inspector 1.The Common Gateway Interface, or CGI, is a set of standards that define how information is exchanged between the web server and a custom script.
To understand the concept of CGI, lets see what happens when we click a hyper link to browse a particular web page or URL. Web Server will parse the URL and will look for the filename in if it finds that file then sends back to the browser otherwise sends an error message indicating that you have requested a wrong file. Web browser takes response from web server and displays either the received file or error message.
However, it is possible to set up the HTTP server so that whenever a file in a certain directory is requested that file is not sent back; instead it is executed as a program, and whatever that program outputs is sent back for your browser to display. All the HTTP header will be in the following form. The date the information becomes invalid. This should be used by the browser to decide when a page needs to be refreshed. A valid date string should be in the format 01 Jan GMT.
You can use this filed to redirect a request to any file. The length, in bytes, of the data being returned. The browser uses this value to report the estimated download time for a file. All the CGI program will have access to the following environment variables. These variables play an important role while writing any CGI program. The data type of the content.
Used when the client is sending attached content to the server. For example file upload etc. The User-Agent request-header field contains information about the user agent originating the request. Its name of the web browser.Dynamic tutorial 3rd sem question paper solved
The IP address of the remote host making the request. This can be useful for logging or for authentication purpose.PERL Tutorial - 1 - PERL Tutorial for Beginners - 1 - Perl Scripting Language Tutorial - Edureka
The fully qualified name of the host making the request. Sometime it is desired that you want to give option where a use will click a link and it will pop up a "File Download" dialogue box to the user in stead of displaying actual content. This is very easy and will be achived through HTTP header.
Prof. Stewart Weiss, Department of Computer Science, Hunter College
For example,if you want make a FileName file downloadable from a given link then its syntax will be as follows. You must have come across many situations when you need to pass some information from your browser to web server and ultimately to your CGI Program.
Most frequently browser uses two methods two pass this information to web server. The GET method sends the encoded user information appended to the page request. The page and the encoded information are separated by the? The GET method is the defualt method to pass information from browser to web server and it produces a long string that appears in your browser's Location:box.
Never use the GET method if you have password or other sensitive information to pass to the server. The GET method has size limtation: only characters can be in a request string. Here is the actual output of the above form, You enter First and Last Name and then click submit button to see the result.
This packages the information in exactly the same way as GET methods, but instead of sending it as a text string after a? This message comes into the CGI script in the form of the standard input.
HTTP protocol is a stateless protocol.
But for a commercial website it is required to maintain session information among different pages. For example one user registration ends after completing many pages.
But how to maintain user's session information across all the web pages. In many situations, using cookies is the most efficient method of remembering and tracking preferences, purchases, commissions, and other information required for better visitor experience or site statistics.Chapter 6 of Beginning Perl for Bioinformatics.
Write a subroutine to report the percentage of each nucleotide in DNA.
Perl: Lecture 2 notes
Count the number of each nucleotide, divide by the total length of the DNA, then multiply by to get the percentage. Your arguments should be the DNA and the nucleotide you want to report on. The int function can be used to discard digits after the decimal point, if needed.
Using the CPAN web site, locate a module for verifying credit card numbers. Download and build it don't try to install it, because you need root privileges to do this. Store the relationships between the name of a restriction site and its regular expression in a hash. Subroutines Subroutines are blocks of code that you can call in different places and contexts. Subroutines can take arguments, and return results. Why is this useful? Because it lets you solve a problem once and then reuse your solution over and over again.
For example, say you've written a chunk of code that normalizes a DNA sequence by removing unwanted characters. By turning it into a named subroutine, you can reuse this piece of code over and over again within the same program without cutting and pasting. Later, you'll be able to put this subroutine into a personal code library and reuse it among many scripts.
Subroutines also make scripts shorter and easier to understand. To do this, you've written several statements that lowercase the sequence, and remove whitespace. Usually you will call return at the very end of the subroutine, but you can call it earlier in special cases if you want to exit the subroutine earlier. Usually the subroutine definitions go at the bottom of the script, following the last statement. To visually separate the statements from the subroutine, you can add a comment line if you like.
Modules extend the ability of Perl. When you load the File::Basename module, you get two new functions, basename and dirname. The use function loads up the module named File::Basename and imports the two functions. Example 2: The Env Module The Env module is a standard module that provides access to the environment variables.
When you load it, it imports a set of scalar variables corresponding to your environment. My username is lstein Finding out What Modules are Installed Here are some tricks for finding out what modules are installed.Lecture Notes What is Perl? Perl is a Programming Language Written by Larry Wall in late 80's to process mail on Unix systems and since extended by a huge cast of characters.
Java Interpreted, fully object-oriented language. Built into web browsers. Supposed to be cross-platform, but not quite yet. Python Interpreted, fully object-oriented language. Rich set of libraries. Elegant syntax. Smaller user community than Java or Perl. Some Simple Scripts Here are some simple scripts to illustrate the "look" of a Perl program. Print a Message to the Terminal Code:. Some hints to help you get going.
Creating the Script A Perl script is just a text file. Use any text programmer's editor.
By convention, Perl script files end with the extension. The Emacs text editor has a Perl mode that will auto-format your Perl scripts and highlight keywords. Perl mode will be activated automatically if you end the script name with.
Running the Script Option 1 Run the perl program from the command line, giving it the name of the script file to run. To avoid this, you can add the current directory ". To do this, create a file in your home directory named. The next time you log in, your path will contain the current directory and you can type "time. Common Errors Every script goes through a few iterations before you get it right.
Here are some common errors: Syntax Errors Code:. You can call Perl with a few command-line options to help catch errors: -c Perform a syntax check, but don't run.
Usually you will invoke these from the command-line, as in perl -cw time. You can also put them in the top line:!
Perl Statements A Perl script consists of a series of statements and comments. Each statement is a command that is recognized by the Perl interpreter and executed. Statements are terminated by the semicolon character. They are also usually separated by a newline character to enhance readability.They cover everything from carriers, to tracking, to notific. Super easy to install and use.
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