public interface  oadd.org.apache.commons.math.analysis.DifferentiableMultivariateRealFunction extends java.lang.Object implements oadd.org.apache.commons.math.analysis.MultivariateRealFunction
{
public abstract oadd.org.apache.commons.math.analysis.MultivariateRealFunction partialDerivative(int);
public abstract oadd.org.apache.commons.math.analysis.MultivariateVectorialFunction gradient();
}