Software development

Fussy: A tool for automatic error propagation

I wrote the fussy programmable calculator, where numbers can be specified with associated errors and errors are automatically propagated during the evaluation of the expressions. E.g.:

   fussy 2.0
   Copyright 2000-2004,2005 S.Bhatnagar (sbhatnag (AT) nrao (DOT) edu)
   This is free software with ABSOLUTELY NO WARRANTY.
   For details type `warranty'.
   >x=0.5pm0.1;y=0.4pm0.2
   >print "x=",x,"\ny=",y,"\n"
     x=   0.50000 +/-    0.10000
     y=   0.40000 +/-    0.20000
   >sin(x)*cos(y)/(x*y)
           2.20790 +/-    1.29119
	

The software can be downloaded from here. It is also available as a SourceForge Project and a Google Code Project.
The instructions for installation are here.

CLLib: A User interface library

I also wrote the cllib library for a general purpose user interface. It was designed for ease of use for the programmer as well as the end-user. It embeds a shell in the application and gives services that the application writers can use to interact with the user. The shell can be customized via command-line arguments or via environment variables. The user can access the shell via simple "arg=value1,value2,..." command-line arguments (useful when writing pipelines) or in an interactive session.

The library can be downloaded from here. A simple programmer document is here.

Software for making a album/slideshow web interface

I wrote a set of UNIX shell scripts (for bash and sh shells) and Javascripts to build a web interface for a slideshow of pictures organized in any number of albums. The albums are organized as a directory tree on the disk. Given the root of this tree, the scripts traverse the tree, and emit Javascript. This Javascript uses the slideshow class and provides a web interface with a list of available albums and buttons for managing a slideshow of the selected album. Click here for an example.

The name of the album (appears in the selection list), the title for the album (appears on the top of each slide) and the captions for each slide can also be supplied as text files in the album directory.

The software can be downloaded form here. The procedure for making a web interface is here.

The HTML/Java code for the slideshow class used here was originally produced using the very useful tool from BarelyFitz Designs and later significantly modified to get to the present form.