ReadOnlyDoubleMatrixSubtract Method (Double, ReadOnlyDoubleMatrix) |
Namespace: Novacta.Analytics
Exception | Condition |
---|---|
ArgumentNullException | right is null. |
Let and
be the right
number of rows and columns, respectively, and let its generic entry given by
The method returns a matrix having
the same dimensions of right, whose generic
entry is:
In the following example, a matrix is subtracted from a scalar.
using System; namespace Novacta.Analytics.CodeExamples { public class SubtractionExample2 { public void Main() { // Create the left operand. double left = 10.0; Console.WriteLine("left ="); Console.WriteLine(left); Console.WriteLine(); // Create the right operand. var data = new double[6] { 0, 20, 40, 10, 30, 50, }; var right = DoubleMatrix.Dense(2, 3, data, StorageOrder.RowMajor); Console.WriteLine("right ="); Console.WriteLine(right); // Subtract right from left. var result = left - right; Console.WriteLine(); Console.WriteLine("left - right ="); Console.WriteLine(result); // In .NET languages that do not support overloaded operators, // you can use the alternative methods named Subtract. result = DoubleMatrix.Subtract(left, right); Console.WriteLine(); Console.WriteLine("DoubleMatrix.Subtract(left, right) returns"); Console.WriteLine(); Console.WriteLine(result); // Both operators and alternative methods are overloaded to // support read-only matrix arguments. // Compute the subtraction using a read-only wrapper of right. ReadOnlyDoubleMatrix readOnlyRight = right.AsReadOnly(); result = left - readOnlyRight; Console.WriteLine(); Console.WriteLine("left - readOnlyRight ="); Console.WriteLine(result); } } } // Executing method Main() produces the following output: // // left = // 10 // // right = // 0 20 40 // 10 30 50 // // // // left - right = // 10 -10 -30 // 0 -20 -40 // // // // DoubleMatrix.Subtract(left, right) returns // // 10 -10 -30 // 0 -20 -40 // // // // left - readOnlyRight = // 10 -10 -30 // 0 -20 -40 //