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AIX Version 4.3 Base Operating System and Extensions Technical Reference, Volume 2
SDOT or DDOT Function
Purpose
Returns the dot product of two vectors.
Library
BLAS Library (libblas.a)
FORTRAN Syntax
REAL FUNCTION SDOT(N, X, INCX, Y, INCY)
INTEGER INCX, INCY, N
REAL X(*), Y(*)
DOUBLE PRECISION FUNCTION DDOT(N, X, INCX, Y, INCY)
INTEGER INCX, INCY, N
DOUBLE PRECISION X(*), Y(*)
Description
The SDOT or DDOT function returns the dot product of vectors X and Y.
Parameters
N |
On entry, N specifies the number of elements in X and Y; unchanged on exit. |
X |
Vector of dimension at least (1 + (N-1) * abs(INCX) ); unchanged on exit. |
INCX |
On entry, INCX specifies the increment for the elements of X; unchanged on exit. |
Y |
Vector of dimension at least (1 + (N-1) * abs(INCY) ); unchanged on exit. |
INCY |
On entry, INCY specifies the increment for the elements of Y; unchanged on exit. |
Error Codes
For values of N <= 0, a value of 0 is returned.
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