public interface IScalarField {

	public double getVal(double [] arrLfLoc);
	
	/**
     * Gradient at a particular location for field
     * @param arrLoc place at which to take gradient
     * @return gradient (of proper dimensionality) as a double []
     */
    public double [] getGradient(double arrLoc[]);
    
    
    /**
     * Gradient at a particular location for field
     * @param arrLoc place at which to take gradient
     * @param arrRslt gradient (of proper dimensionality) as a double []
     */
    public void getGradient(double arrLoc[], double arrRslt[]);
	
	public IScalarField makeCopy();
}