How to convert cli::array<double>^ x to const double* data

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C++/CLI

I am trying to use the co-ordinate array from richtextbox and use for plot a graph in c++/cli. but i have a problem to convert cli::array<double>^ x to const double* data.please help me.

What I have tried:

cli::array<String^>^ x = richTextBox5->Lines;
cli::array<String^>^ y = richTextBox3->Lines;
Converter<String^, double>^ converter = gcnew Converter<String^, double>(double::Parse);
cli::array<double>^ SortY = Array::ConvertAll(y, converter);
cli::array<double>^ SortX = Array::ConvertAll(x, converter);
for (int i = 0; i < richTextBox5->Lines->Length; i++)

		{double* arrx = new double[richTextBox5->Lines->Length]{ SortX[i] };
		 double* arry = new double[richTextBox3->Lines->Length]{ SortY[i] };
		for (int i = 0; i < richTextBox5->Lines->Length; i++) 
{
				arrx[i] =  SortX[i];
				arry[i] = SortY[i];
//for plot i use chardir library.
c->addScatterLayer(DoubleArray(arrx, richTextBox5->Lines->Length), DoubleArray(arry, richTextBox3->Lines->Length),"", Chart::DiamondSymbol, 13, 0xff9933);
c->makeChart("scatter1.png");