interval.sourceforge.net/scheme/giaeval

A Graphical User Interface to an interval arithmetic evaluator which operates on general intervals (i.e. finite unions of connected sets of reals as described in the paper Interval Arithmetic: from Principles to Implementation by Hickey, Qun, van Emden This applet is implemented in entirely in JScheme using the java.math.BigDecimal package to implement rounded arithmetic operations.

Source code

• opparse.scm -- an operator precedence grammar parse generator in Scheme
• ereal.scm -- an implementation of extended reals on top of java.math.BigDecimal
• gia.scm -- an implementation of general interval arithmetic operations
• iaeval.scm -- an interval arithmetic evaluator on syntax trees
• iaevaldemo.scm -- a GUI for the general interval arithmetic evaluator
• iaevaldemo.html -- the webpage containing the GUI

Related papers

• "Interval Arithmetic: from Principles to Implementation" (.ps.gz)
  by Hickey, Qun, van Emden
  Submitted to JACM

• "Silk: A Playful Combination of Scheme and Java" (.ps)
  by Ken Anderson, Timothy J. Hickey, and Peter Norvig
  in Proceeedings of Scheme2000