VMS Help RTL Routines, MTH$, BLAS1$VxAXPY, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 n

    OpenVMS usage:longword_signed
    type:         longword integer (signed)
    access:       read only
    mechanism:    by reference

    Number of elements in vectors x and y. The n argument is the
    address of a signed longword integer containing the number of
    elements. If n is less than or equal to 0, then y is unchanged.

 a

    OpenVMS usage:floating_point or complex_number
    type:         F_floating, D_floating, G_floating real or
                  F_floating, D_floating, G_floating complex
    access:       read only
    mechanism:    by reference, array reference

    Scalar multiplier for the array x. The a argument is the address
    of a floating-point or floating-point complex number that is this
    multiplier. If a equals 0, then y is unchanged. If a shares a
    memory location with any element of the vector y, results are
    unpredictable. Specify the same data type for arguments a, x, and
    y.

 x

    OpenVMS usage:floating_point or complex_number
    type:         F_floating, D_floating, G_floating real or
                  F_floating, D_floating, G_floating complex
    access:       read only
    mechanism:    by reference, array reference

    Array containing the elements to be accessed. All elements of
    array x are accessed only if the increment argument of x, called
    incx, is 1. The x argument is the address of a floating-point or
    floating-point complex number that is this array. The length of
    this array is at least:

    1+(n-1)*|incx|

    where:

    n   =  number of vector elements specified in n
    incx=  increment argument for the array x specified in incx

    Specify the data type as follows:

    Routine            Data Type for x

    BLAS1$VSAXPY       F-floating real
    BLAS1$VDAXPY       D-floating real
    BLAS1$VGAXPY       G-floating real
    BLAS1$VCAXPY       F-floating complex
    BLAS1$VZAXPY       D-floating complex
    BLAS1$VWAXPY       G-floating complex

    If any element of x shares a memory location with an element of
    y, the results are unpredictable.

 incx

    OpenVMS usage:longword_signed
    type:         longword integer (signed)
    access:       read only
    mechanism:    by reference

    Increment argument for the array x. The incx argument is the
    address of a signed longword integer containing the increment
    argument. If incx is greater than or equal to 0, then x is
    referenced forward in array x; that is, xi is referenced in:

    x(1+(i-1)*incx)

    where:

    x   =  array specified in x
    i   =  element of the vector x
    incx=  increment argument for the array x specified in incx

    If incx is less than 0, then x is referenced backward in array x;
    that is, xi is referenced in:

    x(1+(n-i)*|incx|)

    where:

    x   =  array specified in x
    n   =  number of vector elements specified in n
    i   =  element of the vector x
    incx=  increment argument for the array x specified in incx

 y

    OpenVMS usage:floating_point or complex_number
    type:         F_floating, D_floating, G_floating real or
                  F_floating, D_floating, G_floating complex
    access:       modify
    mechanism:    by reference, array reference

    On entry, array containing the elements to be accessed. All
    elements of array y are accessed only if the increment argument
    of y, called incy, is 1. The y argument is the address of a
    floating-point or floating-point complex number that is this
    array. The length of this array is at least:

    1+(n-1)*|incy|

    where:

    n   =  number of vector elements specified in n
    incy=  increment argument for the array y specified in incy

    Specify the data type as follows:

    Routine            Data Type for y

    BLAS1$VSAXPY       F-floating real
    BLAS1$VDAXPY       D-floating real
    BLAS1$VGAXPY       G-floating real
    BLAS1$VCAXPY       F-floating complex
    BLAS1$VZAXPY       D-floating complex
    BLAS1$VWAXPY       G-floating complex

    If n is less than or equal to 0, then y is unchanged. If any
    element of x shares a memory location with an element of y, the
    results are unpredictable.

    On exit, y contains an array of length at least:

    1+(n-1)*|incy|

    where:

    n   =  number of vector elements specified in n
    incy=  increment argument for the array y specified in incy

    After the call to BLAS1$VxAXPY, yi is set equal to:

    y[i]+a*x[i]

    where:

    y  =  the vector y
    i  =  element of the vector x or y
    a  =  scalar multiplier for the vector x specified in a
    x  =  the vector x

 incy

    OpenVMS usage:longword_signed
    type:         longword integer (signed)
    access:       read only
    mechanism:    by reference

    Increment argument for the array y. The incy argument is the
    address of a signed longword integer containing the increment
    argument. If incy is greater than or equal to 0, then y is
    referenced forward in array y; that is, (y[i]) is referenced
    in:

    y(1+(i-1)*incy)

    where:

    y   =  array specified in y
    i   =  element of the vector y
    incy=  increment argument for the array y specified in incy

    If incy is less than 0, then y is referenced backward in array y;
    that is, (y[i]) is referenced in:

    y(1+(n-i)*|incy|)

    where:

    y   =  array specified in y
    n   =  number of vector elements specified in n
    i   =  element of the vector y
    incy=  increment argument for the array y specified in incy