tgb_matrix Class Reference

#include <tgbgauss.h>

Public Member Functions
	tgb_matrix (int i, int j)
	~tgb_matrix ()
int	get_rows ()
int	get_columns ()
void	print ()
void	perm_rows (int i, int j)
void	set (int i, int j, number n)
number	get (int i, int j)
BOOLEAN	is_zero_entry (int i, int j)
void	free_row (int row, BOOLEAN free_non_zeros=TRUE)
int	min_col_not_zero_in_row (int row)
int	next_col_not_zero (int row, int pre)
BOOLEAN	zero_row (int row)
void	mult_row (int row, number factor)
void	add_lambda_times_row (int add_to, int summand, number factor)
int	non_zero_entries (int row)

Private Attributes
number **	n
int	columns
int	rows
BOOLEAN	free_numbers

Detailed Description

Definition at line 18 of file tgbgauss.h.

Constructor & Destructor Documentation

tgb_matrix()

tgb_matrix::tgb_matrix	(	int	i,
		int	j
	)

Definition at line 460 of file tgbgauss.cc.

{
  n=(number**) omAlloc(i*sizeof (number*));;
  int z;
  int z2;
  for(z=0;z<i;z++)
  {
    n[z]=(number*)omAlloc(j*sizeof(number));
    for(z2=0;z2<j;z2++)
    {
      n[z][z2]=nInit(0);
    }
  }
  columns=j;
  rows=i;
  free_numbers=FALSE;
}

~tgb_matrix()

tgb_matrix::~tgb_matrix

(

)

Definition at line 478 of file tgbgauss.cc.

{
  int z;
  for(z=0;z<rows;z++)
  {
    if(n[z])
    {
      if(free_numbers)
      {
        int z2;
        for(z2=0;z2<columns;z2++)
        {
          nDelete(&(n[z][z2]));
        }
      }
      omFree(n[z]);
    }
  }
  omfree(n);
}

Member Function Documentation

add_lambda_times_row()

void tgb_matrix::add_lambda_times_row	(	int	add_to,
		int	summand,
		number	factor
	)

Definition at line 604 of file tgbgauss.cc.

{
  int i;
  for(i=0;i<columns;i++)
  {
    if(!(nIsZero(n[summand][i])))
    {
      number n1=n[add_to][i];
      number n2=nMult(factor,n[summand][i]);
      n[add_to][i]=nAdd(n1,n2);
      nDelete(&n1);
      nDelete(&n2);
    }
  }
}

free_row()

void tgb_matrix::free_row	(	int	row,
		BOOLEAN	free_non_zeros = TRUE
	)

Definition at line 636 of file tgbgauss.cc.

{
  int i;
  for(i=0;i<columns;i++)
    if((free_non_zeros)||(!(nIsZero(n[row][i]))))
      nDelete(&(n[row][i]));
  omFree(n[row]);
  n[row]=NULL;
}

get()

number tgb_matrix::get	(	int	i,
		int	j
	)

Definition at line 538 of file tgbgauss.cc.

{
  assume(i<rows);
  assume(j<columns);
  return n[i][j];
}

get_columns()

int tgb_matrix::get_columns

(

)

Definition at line 533 of file tgbgauss.cc.

{
  return columns;
}

get_rows()

int tgb_matrix::get_rows

(

)

Definition at line 528 of file tgbgauss.cc.

{
  return rows;
}

is_zero_entry()

BOOLEAN tgb_matrix::is_zero_entry	(	int	i,
		int	j
	)

Definition at line 545 of file tgbgauss.cc.

{
  return (nIsZero(n[i][j]));
}

min_col_not_zero_in_row()

int tgb_matrix::min_col_not_zero_in_row

(

int

row

)

Definition at line 558 of file tgbgauss.cc.

{
  int i;
  for(i=0;i<columns;i++)
  {
    if(!(nIsZero(n[row][i])))
      return i;
  }
  return columns;//error code
}

mult_row()

void tgb_matrix::mult_row	(	int	row,
		number	factor
	)

Definition at line 620 of file tgbgauss.cc.

{
  if (nIsOne(factor))
    return;
  int i;
  for(i=0;i<columns;i++)
  {
    if(!(nIsZero(n[row][i])))
    {
      number n1=n[row][i];
      n[row][i]=nMult(n1,factor);
      nDelete(&n1);
    }
  }
}

next_col_not_zero()

int tgb_matrix::next_col_not_zero	(	int	row,
		int	pre
	)

Definition at line 569 of file tgbgauss.cc.

{
  int i;
  for(i=pre+1;i<columns;i++)
  {
    if(!(nIsZero(n[row][i])))
      return i;
  }
  return columns;//error code
}

non_zero_entries()

int tgb_matrix::non_zero_entries

(

int

row

)

Definition at line 591 of file tgbgauss.cc.

{
  int i;
  int z=0;
  for(i=0;i<columns;i++)
  {
    if(!(nIsZero(n[row][i])))
      z++;
  }
  return z;
}

perm_rows()

void tgb_matrix::perm_rows	(	int	i,
		int	j
	)

Definition at line 550 of file tgbgauss.cc.

{
  number* h;
  h=n[i];
  n[i]=n[j];
  n[j]=h;
}

print()

void tgb_matrix::print

(

)

Definition at line 499 of file tgbgauss.cc.

{
  int i;
  int j;
  PrintLn();
  for(i=0;i<rows;i++)
  {
    PrintS("(");
    for(j=0;j<columns;j++)
    {
      StringSetS("");
      n_Write(n[i][j],currRing->cf);
      char *s=StringEndS();
      PrintS(s);
      omFree(s);
      PrintS("\t");
    }
    PrintS(")\n");
  }
}

set()

void tgb_matrix::set	(	int	i,
		int	j,
		number	n
	)

Definition at line 521 of file tgbgauss.cc.

{
  assume(i<rows);
  assume(j<columns);
  n[i][j]=nn;
}

zero_row()

BOOLEAN tgb_matrix::zero_row

(

int

row

)

Definition at line 580 of file tgbgauss.cc.

{
  int i;
  for(i=0;i<columns;i++)
  {
    if(!(nIsZero(n[row][i])))
      return FALSE;
  }
  return TRUE;
}

Field Documentation

columns

int tgb_matrix::columns

private

Definition at line 22 of file tgbgauss.h.

free_numbers

BOOLEAN tgb_matrix::free_numbers

private

Definition at line 24 of file tgbgauss.h.

n

number** tgb_matrix::n

private

Definition at line 21 of file tgbgauss.h.

rows

int tgb_matrix::rows

private

Definition at line 23 of file tgbgauss.h.

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The documentation for this class was generated from the following files:

• kernel/GBEngine/tgbgauss.h
• kernel/GBEngine/tgbgauss.cc