dblas.cwp.lib

su 的源代码库

DBLAS - Double precision Basic Linear Algebra subroutines
		(adapted from LINPACK FORTRAN):

idamax	return index of element with maximum absolute value
dasum	return sum of absolute values
daxpy	compute y[i] = a*x[i]+y[i]
dcopy	copy x[i] to y[i] (i.e., set y[i] = x[i])
ddot	return sum of x[i]*y[i] (i.e., return the dot product of x and y)
dnrm2	return square root of sum of squares of x[i]
dscal	compute x[i] = a*x[i]
dswap	swap x[i] and y[i]

Function Prototypes:
int idamax (int n, double *sx, int incx);
double dasum (int n, double *sx, int incx);
void daxpy (int n, double sa, double *sx, int incx, double *sy, int incy);
void dcopy (int n, double *sx, int incx, double *sy, int incy);
double ddot (int n, double *sx, int incx, double *sy, int incy);
double dnrm2 (int n, double *sx, int incx);
void dscal (int n, double sa, double *sx, int incx);
void dswap (int n, double *sx, int incx, double *sy, int incy);

idmax:
Input: 
n		number of elements in array
sx		array[n] of elements
incx		increment between elements 

Returned:
index of element with maximum absolute value (idamax)

dasum:
Input: 
n		number of elements in array
sx		array[n] of elements
incx		increment between elements 

Returned:
sum of absolute values (dasum)

daxpy:
Input: 
n		number of elements in arrays
sa		the scalar multiplier
sx		array[n] of elements to be scaled and added
incx		increment between elements of sx
sy		array[n] of elements to be added
incy		increment between elements of sy

Output:
sy		array[n] of accumulated elements

dcopy:
Input: 
n		number of elements in arrays
sx		array[n] of elements to be copied
incx		increment between elements of sx
incy		increment between elements of sy

Output:
sy		array[n] of copied elements

ddot:
Input:
n		number of elements in arrays
sx		array[n] of elements
incx		increment between elements of sx
sy		array[n] of elements
incy		increment between elements of sy

Returned:	dot product of the two arrays

dnrm2:
Input:
n		number of elements in array
sx		array[n] of elements
incx		increment between elements 

Returned:	square root of sum of squares of x[i]

dscal:
Input:
n		number of elements in array
sa		the scalar multiplier
sx		array[n] of elements
incx		increment between elements 

Output:
sx		array[n] of scaled elements

Author:  Dave Hale, Colorado School of Mines, 10/01/89