TMtxExpression.DefineVector Method

Overload List

#	Signature	Description
1	TVectorValue DefineVector(String AVarName)	Use internal vector.
2	TVectorValue DefineVector(String AVarName, TVec Vec)	Defines new vector variable.

Overload 1: TVectorValue DefineVector(String AVarName)

Use internal vector.

#	Name	Type	Description
1	AVarName	String

Returns: TVectorValue

Overload 2: TVectorValue DefineVector(String AVarName, TVec Vec)

Defines new vector variable.

#	Name	Type	Description
1	AVarName	String
2	Vec	TVec	source TVec

Returns: TVectorValue

Remarks:

If variable with name AVarName already was definded, it is redefined and all expressions which contain the symbol AVarName will be recompiled before the next evaluation. External vector may be assigned as values holder. If external vector is not assigned, internal vector will be used.

Examples

using Dew.Math;
using Dew.Math.Units;

namespace Dew.Examples
{
    void Example()
    {
        // 1. Define variables
        TVectorValue = MyParser.DefineVector("x");
        TDoubleValue s = MyParser.DefineDouble('s');

        // 2. Set values
        x.Value.SetIt(false,new double[] {1,-1,1});
        s.DoubleValue = 0.5;

        // 3. Add formula and evaluate,
        MyParser.AddExpr("-s*x");
        Vector res = new Vector(0);

        res = MyParser.EvaluateVector();
        // res = (-0.5,0.5, -0.5)
    }
}