Function

vDSP_vsmsaD(_:_:_:_:_:_:_:)

Multiplies the product of a double-precision vector and a double-precision scalar value by a double-precision scalar value.

Declaration

func vDSP_vsmsaD(_ __A: UnsafePointer<Double>, _ __IA: vDSP_Stride, _ __B: UnsafePointer<Double>, _ __C: UnsafePointer<Double>, _ __D: UnsafeMutablePointer<Double>, _ __ID: vDSP_Stride, _ __N: vDSP_Length)

Parameters

__A

Double-precision real input vector.

__IA

Stride for A.

__B

Pointer to double-precision real input scalar.

__C

Pointer to double-precision real input scalar.

__D

Double-precision real output vector.

__ID

Stride for D.

__N

The number of elements to process.

Discussion

This function calculates the products of the first N elements of A and the scalar value B, adds each product to the scalar value C, and writes the result to D:

A diagram showing the operation of the vDSP_vsmsa function. There are five rows. The top two rows represents the first two inputs, vector A and scalar B. The third row represents the intermediate result of the first two inputs. The forth row represents the third input, vector C. The bottom row represents the output, vector D. The diagram has connecting lines from the input vectors to the output vector indicating the relationships between the inputs and output.

The operation is:

for (n = 0; n < N; ++n)
    D[n] = A[n]*B + C;

See Also

Ternary (Vector-Scalar-Scalar) Multiply-Add Operations

func vDSP_vsmsa(UnsafePointer<Float>, vDSP_Stride, UnsafePointer<Float>, UnsafePointer<Float>, UnsafeMutablePointer<Float>, vDSP_Stride, vDSP_Length)

Multiplies the product of a single-precision vector and a single-precision scalar value by a single-precision scalar value.

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