StdVecOps Namespace Reference

Functions
long	sum (const std::vector< int > &a_iv)
long	product (const std::vector< int > &a_iv)
void	copyFrom (std::vector< int > &a_iv, const int *const a_iv_carr, int a_n)
void	add (std::vector< int > &a_iv, const int a_a)
void	copyFrom (std::vector< double > &a_iv, const double *const a_iv_carr, int a_n)
void	createNormalVector (std::vector< double > &a_normal_vec, const int *a_vec, const int a_size)
void	createNormalVector (std::vector< double > &a_normal_vec, const std::vector< int > &a_vec)
double	compute2Norm (const std::vector< double > &a_a, const std::vector< double > &a_b)

Detailed Description

Vector operations defined for the std::vector class

Function Documentation

long StdVecOps::sum ( const std::vector< int > &  a_iv )

inline

Sum of all elements

Parameters

a_iv	Integer vector

Definition at line 18 of file std_vec_ops.h.

  {
    long retval(0);
    for (int i=0; i<a_iv.size(); i++) retval += a_iv[i];
    return retval;
  }

long StdVecOps::product ( const std::vector< int > &  a_iv )

inline

Product of all elements

Parameters

a_iv	Integer vector

Definition at line 27 of file std_vec_ops.h.

  {
    long retval(1);
    for (int i=0; i<a_iv.size(); i++) retval *= a_iv[i];
    return retval;
  }

void StdVecOps::copyFrom ( std::vector< int > &  a_iv, const int *const  a_iv_carr, int  a_n  )

inline

Copy from a C-array

Parameters

a_iv	C++ vector of ints
a_iv_carr	C array of ints
a_n	size

Definition at line 36 of file std_vec_ops.h.

  {
    a_iv.resize(a_n);
    for (int i=0; i<a_n; i++) a_iv[i] = a_iv_carr[i];
    return;
  }

void StdVecOps::add ( std::vector< int > &  a_iv, const int  a_a  )

inline

Add constant to all elements of a vector

Parameters

a_iv	C++ vector of ints
a_a	constant to add

Definition at line 48 of file std_vec_ops.h.

  {
    for (int i=0; i<a_iv.size(); i++) a_iv[i] += a_a;
    return;
  }

void StdVecOps::copyFrom ( std::vector< double > &  a_iv, const double *const  a_iv_carr, int  a_n  )

inline

Copy from a C-array

Parameters

a_iv	C++ vector of doubles
a_iv_carr	C array of doubles
a_n	size

Definition at line 57 of file std_vec_ops.h.

  {
    a_iv.resize(a_n);
    for (int i=0; i<a_n; i++) a_iv[i] = a_iv_carr[i];
    return;
  }

void StdVecOps::createNormalVector ( std::vector< double > &  a_normal_vec, const int *  a_vec, const int  a_size  )

inline

Create a normal vector of doubles (of unit magnitude) from a C-array of integers

Parameters

a_normal_vec	Normal vector
a_vec	C-array of integers
a_size	size of C-array

Definition at line 70 of file std_vec_ops.h.

  {
    a_normal_vec = std::vector<double>(a_size, 0.0);
    double magn = 0.0;
    for (int i=0; i<a_size; i++) {
      magn += (double)(a_vec[i]*a_vec[i]);
    }
    magn = sqrt(magn);
    if (magn > _MACHINE_ZERO_) {
      for (int i=0; i<a_size; i++) {
        a_normal_vec[i] = a_vec[i] / magn;
      }
    }
    return;
  }

void StdVecOps::createNormalVector ( std::vector< double > &  a_normal_vec, const std::vector< int > &  a_vec  )

inline

Create a normal vector of doubles (of unit magnitude) from a vector of integers

Parameters

a_normal_vec	Normal vector
a_vec	Integer vector

Definition at line 91 of file std_vec_ops.h.

  {
    createNormalVector( a_normal_vec,
                        a_vec.data(),
                        a_vec.size() );
    return;
  }

double StdVecOps::compute2Norm ( const std::vector< double > &  a_a, const std::vector< double > &  a_b  )

inline

Compute norm between two vectors

Parameters

a_a	input vector
a_b	input vector

Definition at line 102 of file std_vec_ops.h.

  {
    double retval = 0.0;

    for (int i = 0; i < std::min(a_a.size(),a_b.size()); i++) {
      retval += ( (a_a[i]-a_b[i]) * (a_a[i]-a_b[i]) );
    }
    retval = sqrt(retval);

    return retval;
  }