Tag Archives: Computational

datasync

Data syncing and backUP

When we look around us , we are surrounded by data and a lot of information. But in this post I will not be talking about those objects (as they are called in object oriented programming). In this data refers to all the qualitative and quantitative set of information and variables we have stored in our computer. These data be it just collected, reported or even analysed are very crucial for every one. Every individual encounters different type of data. This page will classify different types of data for interested readers.

This post focuses on data back up and syncing. In simple words, it is the act of replicating data between two storage units, but the storage needs to be mirrored. That means change to one will be reflected to the other and vice versa. The advantage of this is that it saves a lot of time than the general copy pasting, and of course it is the ability to preview the changes before they are actually made.

For syncing there are various software in the market, some commercial and some open source applications.  Personally ,I use SyncToy, and have described the process to sync in this post. The good things about this software is it is a freeware and it has a very simple GUI to get the work done.

So here we go.

  1. Install the SyncToy software by downloading it from here.
  2. Once installed, open up the application.
  3. On the window that pops up, click on Create New Folder Pair.
  4. Now choose the folders that you want to sync. Left is the source folder path, Right is the target source folder path.
  5. Click NEXT.
  6.  The next window that follows asks about the type of sync, viz;
    Synchronize: Updates files both ways…keeping changes like renames, deletions and edits to either folder contents the same between the two.
    Echo: New and updated files are copied left to right. Renames and deletes on the left are repeated on the right.
    Contribute: New and updated files are copied left to right. Renames on the left are repeated on the right. No deletions.
  7.  I will recommend using the Contribute option.
  8.  After that, name your syncing action. Choose a suitable name in case you are syncing between different target sources. Click FINISH
  9. On the next window, click RUN, to see the software syncing your data from the source path to the target path.
  10. Once done, click CLOSE to see the report of syncing
  11. To schedule the syncing automatically,  go to Task Scheduler option in windows 7.
  12. Click on Create basic Task
  13. Next type a little name and description to the task like ” DataSYNC SyncToy”
  14.  Go to the trigger option, and select the frequency of syncing up to your convenience.
  15. In the Action tab of the window,  type “C:\Program Files\SyncToy2.1\SyncToy.exe” where it asks for Program/Script.
  16. In the add argument section, type -R
  17. Click Finish to get things done.
  18. Have it a go !
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Guide to good programming in Matlab

Computational Physics by using Matlab

Computational physics can be regarded as an amalgamation of physics with mathematics and computer science. Computers these days have changed the way physics (and all sciences) is done, and computational physics is now widely accepted as an equally valid approach to Physics after Experimental and Theoretical approach.

Matlab is one of the nicest platform to do these physics and has been gaining a lot of popularity in problem solving  these days owing to its visibility and seamless integration feature. You can read more about Matlab here:

Some recommended books for Matlab are:

But Matlab as a platform is really colossal and like and ocean, so we need to be specific about the reason we are using Matlab .

Guide to Good programming:

If it is asked; What are the most important characteristics of a good program,or what do you mean by a good program?

Many people or mostly all will say efficiency and speed. Efficiency can have more synonyms like reliability, accuracy, perfectness etc.  Yes indeed that’s true not very true though. Efficiency and speed are really crucial characteristics of a program but they do not define a program to be a good program or a bad program.

 

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A program that is not efficient or accurate is of not much value , yet it still can be used if we understand the limitation of the program or what contain the accuracy of the code. We need to be the gentle and caring teacher who helps its pupils to understand the lessons. And for the speed; what matters is how long it takes to solve the problem and not how long to execute the program. So the speed can sometimes be traded for more accuracy (at least for experimental physics in which you use Matlab to talk to instruments and order them to solve your work)

Q: So, what is then the most important characteristic of a good program ?

Ans:  It is the clarity of the code that is the most or very crucial aspect of the code.  If its not clear what is the code doing then it is not a good code. If the code does not clearly describe the logic and algorithm of how it is doing our work, then it is not a good code. Unless you are in the receiving end of the code and believe in Data abstraction ideology.

On the other hand, if a code is clear and describes the use of each module, variables, algorithm then we are more likely to understand what is is intended to do. If or when there is an error, we can then very easily cure it as we understand the code, because of its clarity.

A standard problem solving approach for any problem or code is to break the code into smaller chunks called modules. This gives a better understanding of the total problem.This aspect is called as top-down design by physicists.

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Another way to enhance the clarity of a code is to use valid variable names. Imagine reading a computer code asking to solve and integration of sin x over some space, and in the code you encounter a variable name as win32. What sense would  that make?  So employ using valid variable names and also make sure that the code does not have several variables doing the same operation. Try to extract maximum information and utilization from one single variable before it is cloned for some operations which can not be avoided.

This post is all about a basic tutorial of how to code in any programming platform. So start constructing some nice codes.