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DenseVector_Double

A structure that contains a dense vector of double-precision, floating-point values.

Declaration

struct DenseVector_Double

Mentioned in

Overview

You typically use dense vectors to represent the unknowns vector, x, and the right-hand-side vector, b, in the matrix equation Ax = b. A DenseVector_Double structure provides a pointer to its underlying data and a count of its number of elements.

The following code shows an example of how to create a dense vector structure from an array of double-precision values. In this case, use withUnsafeMutableBufferPointer(_:) to pass a pointer to your collection. The DenseVector_Double structure is valid only during the execution of the closure. Don’t store or return the structure for later use.

var vectorValues: [Double] = [10, 20, 30, 40]
let vectorValuesCount = Int32(vectorValues.count)

vectorValues.withUnsafeMutableBufferPointer { vectorValuesPtr in
    
    let vector = DenseVector_Double(count: vectorValuesCount,
                                    data: vectorValuesPtr.baseAddress!)
    
    // Perform operations using `vector`.
}

Topics

Initializers

Inspecting a Vector’s Structure and Data

See Also

Creating dense matrices and dense vectors