// Ceres Solver - A fast non-linear least squares minimizer

// Copyright 2015 Google Inc. All rights reserved.

// http://ceres-solver.org/

//

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// modification, are permitted provided that the following conditions are met:

//

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//   this list of conditions and the following disclaimer.

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//   this list of conditions and the following disclaimer in the documentation

//   and/or other materials provided with the distribution.

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//   used to endorse or promote products derived from this software without

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// Author: sameeragarwal@google.com (Sameer Agarwal)

#include "ceres/function_sample.h"

#include "ceres/stringprintf.h"

namespace ceres {

namespace internal {

FunctionSample::FunctionSample()

    : x(0.0),

      vector_x_is_valid(false),

      value(0.0),

      value_is_valid(false),

      vector_gradient_is_valid(false),

      gradient(0.0),

      gradient_is_valid(false) {}

FunctionSample::FunctionSample(const double x, const double value)

    : x(x),

      vector_x_is_valid(false),

      value(value),

      value_is_valid(true),

      vector_gradient_is_valid(false),

      gradient(0.0),

      gradient_is_valid(false) {}

FunctionSample::FunctionSample(const double x,

                               const double value,

                               const double gradient)

    : x(x),

      vector_x_is_valid(false),

      value(value),

      value_is_valid(true),

      vector_gradient_is_valid(false),

      gradient(gradient),

      gradient_is_valid(true) {}

std::string FunctionSample::ToDebugString() const {

  return StringPrintf("[x: %.8e, value: %.8e, gradient: %.8e, "

                      "value_is_valid: %d, gradient_is_valid: %d]",

                      x, value, gradient, value_is_valid, gradient_is_valid);

}

}  // namespace internal

}  // namespace ceres