public static void zaxpy(int n, Complex ca, Complex[] cx,
int incx, ref Complex[] cy, int incy, int xIndex = 0, int yIndex = 0)
//****************************************************************************80
//
// Purpose:
//
// ZAXPY adds a multiple of one complex <double> vector to another.
//
// Discussion:
//
// This routine uses double precision complex arithmetic.
//
// Licensing:
//
// This code is distributed under the GNU LGPL license.
//
// Modified:
//
// 15 April 2006
//
// Author:
//
// C++ version by John Burkardt
//
// Reference:
//
// Jack Dongarra, Cleve Moler, Jim Bunch, Pete Stewart,
// LINPACK User's Guide,
// SIAM, 1979.
//
// Charles Lawson, Richard Hanson, David Kincaid, Fred Krogh,
// Basic Linear Algebra Subprograms for Fortran Usage,
// Algorithm 539,
// ACM Transactions on Mathematical Software,
// Volume 5, Number 3, September 1979, pages 308-323.
//
// Parameters:
//
// Input, int N, the number of elements in CX and CY.
//
// Input, complex <double> CA, the multiplier of CX.
//
// Input, complex <double> CX[], the first vector.
//
// Input, int INCX, the increment between successive entries of CX.
//
// Input/output, complex <double> CY[], the second vector.
// On output, CY(*) has been replaced by CY(*) + CA * CX(*).
//
// Input, int INCY, the increment between successive entries of CY.
//
{
int i;
switch (n)
{
case <= 0:
return;
}
if (BLAS0.zabs1(ca) == 0.0)
{
return;
}
if (incx != 1 || incy != 1)
{
int ix = incx switch
{
public static int izamax(int n, Complex[] x, int incx, int index = 0)
//****************************************************************************80
//
// Purpose:
//
// IZAMAX indexes the complex <double> vector element of maximum absolute value.
//
// Discussion:
//
// This routine uses double precision complex arithmetic.
//
// WARNING: This index is a 1-based index, not a 0-based index!
//
// Licensing:
//
// This code is distributed under the GNU LGPL license.
//
// Modified:
//
// 15 April 2006
//
// Author:
//
// C++ version by John Burkardt
//
// Reference:
//
// Jack Dongarra, Cleve Moler, Jim Bunch, Pete Stewart,
// LINPACK User's Guide,
// SIAM, 1979.
//
// Charles Lawson, Richard Hanson, David Kincaid, Fred Krogh,
// Basic Linear Algebra Subprograms for FORTRAN usage,
// ACM Transactions on Mathematical Software,
// Volume 5, Number 3, pages 308-323, 1979.
//
// Parameters:
//
// Input, int N, the number of entries in the vector.
//
// Input, complex <double> X[], the vector.
//
// Input, int INCX, the increment between successive entries of X.
//
// Output, int IZAMAX, the index of the element of maximum
// absolute value.
//
{
int i;
double smax;
int value = 0;
if (n < 1 || incx <= 0)
{
return(value);
}
value = 1;
switch (n)
{
case 1:
return(value);
}
if (incx != 1)
{
int ix = 0;
smax = BLAS0.zabs1(x[index + 0]);
ix += incx;
for (i = 1; i < n; i++)
{
if (smax < BLAS0.zabs1(x[index + ix]))
{
value = i + 1;
smax = BLAS0.zabs1(x[index + ix]);
}
ix += incx;
}
}
else
{
smax = BLAS0.zabs1(x[index + 0]);
for (i = 1; i < n; i++)
{
if (!(smax < BLAS0.zabs1(x[index + i])))
{
continue;
}
value = i + 1;
smax = BLAS0.zabs1(x[index + i]);
}
}
return(value);
}