19b4b0bea9c63cadf71f387ea410f3548bff8e97,brian2/equations/equations.py,Equations,check_units,#Equations#,498

Before Change

        for var in self._diff_equation_names:            
            dim_RHS = self._get_units_for_RHS(var)
            dim_LHS = get_dimensions(self._units[var] / second)
            if not dim_LHS is dim_RHS:
                raise DimensionMismatchError(("Differential equation defining "
                                              "%s is not homogeneous") % var,
                                             dim_LHS, dim_RHS)
        for var in self._static_equation_names:
            dim_RHS = self._get_units_for_RHS(var)            
            dim_LHS = get_dimensions(self._units[var])
            if not dim_LHS is dim_RHS:
                raise DimensionMismatchError(("Static equation defining "
                                              "%s is not homogeneous") % var,

After Change

        //TODO: Check for dependencies and reorder static equations

    def check_units(self):
        for var, eq in self._equations.iteritems():
            if eq.eq_type == "parameter":
                // no need to check units for parameters
                continue
            
            if eq.eq_type == "diff_equation":
                try:
                    eq.expr.check_unit_against(self._units[var] / second,
                                               self._units)
                except DimensionMismatchError as dme:
                    raise DimensionMismatchError(("Differential equation defining "
                                                  "%s does not use consistent units: %s") % 
                                                 (var, dme.desc), *dme._dims)
            elif eq.eq_type == "static_equation":
                try:
                    eq.expr.check_unit_against(self._units[var],
                                               self._units)
                except DimensionMismatchError as dme:
                    raise DimensionMismatchError(("Static equation defining "
                                                  "%s does not use consistent units: %s") % 
                                                 (var, dme.desc), *dme._dims)                
            else:
                raise AssertionError("Unknown equation type: "%s"" % eq.eq_type)
        
    //
    // Representation
    // 

    def __str__(self):
        strings = [str(eq) for eq in self._equations.itervalues()]
        return "\n".join(strings)

Instances