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 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
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 *      http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.commons.math3.fitting.leastsquares;

import org.apache.commons.math3.linear.RealMatrix;
import org.apache.commons.math3.linear.RealVector;

A interface for functions that compute a vector of values and can compute their
derivatives (Jacobian).
Since:
3.4/**
 * A interface for functions that compute a vector of values and can compute their
 * derivatives (Jacobian).
 *
 * @since 3.4
 */
public interface ValueAndJacobianFunction extends MultivariateJacobianFunction {
    
Compute the value.
Params:
params – Point.
Returns:
the value at the given point./**
     * Compute the value.
     *
     * @param params Point.
     * @return the value at the given point.
     */
    RealVector computeValue(final double[] params);

    
Compute the Jacobian.
Params:
params – Point.
Returns:
the Jacobian at the given point./**
     * Compute the Jacobian.
     *
     * @param params Point.
     * @return the Jacobian at the given point.
     */
    RealMatrix computeJacobian(final double[] params);
}