Pyvolution Software Requirements Specification
By everyone

INTRODUCTION


OVERALL DESCRIPTION 



DEFINITIONS

REQUIREMENT SECTION

Introduction

Each requirement has a priority (e.g. P1).  The priority number is
given at the end of each requirement.

Requirements
- The information from a .tsh file shall be converted to a data
structure that pyvolution understands.
 - The vertex attribute information will be converted to field values
 and they shall be accessable using the attribute tag.

- Volumes will have a region tag. This shall be implemented using the
  principals of set theory.

- For a given region and a given field value/conserved quantity apply
  a supplied function with parameters (x,y and the old value
  of the field value/conserved quantity).  
  - Also need a flag specifying if the vertex or centroid values are
  being set.(Rational - will can be used to avoid discontinuites/ or
  create them, depending on what is required.)
  Example calls: domain.set_field_values('bed_elevation', 
		   			 f, location='vertices')
					 
  Example calls: domain.set_conserved_quantities('stage', f, 
					         location='centroid')
					 				 
					
					
  where f has the form
  def f(x, y, old_value):
      ...
      return z										 
 
 
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