Added another example of how to use mat.Dense in SymbolicMath.go

Author: Kwesi Rutledge

README.md

@@ -12,7 +12,7 @@ Some key features include:
   in as few lines as you wish (e.g., `x.Transpose().Multiply(Q).Multiply(x)`)
 - Simple API for defining constants and variables
 - Recognition of [gonum](https://www.gonum.org/) matrices and vectors
-  in most operations
+  in most operations (e.g., `vv1.Plus(mat.NewVecDense(N, []float64{1, 2, 3}))`)
 
 Some documentation can be found by clicking the "reference" badge above.
 

examples/gonum2/gonum2.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"github.com/MatProGo-dev/SymbolicMath.go/symbolic"
+	"gonum.org/v1/gonum/mat"
+)
+
+/*
+gonum2.go
+Description:
+
+	This script is meant to demonstrate the use of the gonum package's
+	matrices in an operation with the symbolic package.
+*/
+func main() {
+	// Constants
+	N := 3
+	vv1 := symbolic.NewVariableVector(N)
+	Q := mat.NewDense(N, N, []float64{1, 0, 0, 0, 2, 0, 0, 0, 3})
+
+	// Sum vv1 with a mat.VecDense object from the gonum package
+	sum2 := vv1.Transpose().Multiply(Q)
+
+	// Print the result
+	fmt.Println(sum2.String())
+}

symbolic/variable_matrix.go

@@ -248,7 +248,12 @@ func (vm VariableMatrix) Multiply(e interface{}) Expression {
 			}
 			return result
 		}
-
+	case *mat.Dense:
+		// Use the mat.Dense case
+		return vm.Multiply(DenseToKMatrix(*right))
+	case mat.Dense:
+		// Use the KMatrix case
+		return vm.Multiply(DenseToKMatrix(right))
 	case KMatrix:
 		// Collect dimensions
 		nResultRows, nResultCols := vm.Dims()[0], right.Dims()[1]