problem in initializing an array

[dcftci]

I tried to initialize an array in the constructor of my class. here is how it looks.

MyClass::MyClass(double**arr, int N,int d)
{
	firstd=N;
	secd=d;
	arr=new double*[firstd];
	for(int i=0;i<firstd;i++)
	{
		arr[i]=new double [secd];
	}
	for(int i=0;i<N;i++)
	{
		for(int j=0;j<d;j++)
		{
			arr[i][j]=0;
		}
	}
}

but when I try to use it in main function like below code:

double **myarr;
	int N=5,d=4,i;
	MyClass ıhopeitworks(myarr,N,d);

It gives a run time error and says that myarr is not initialized
and I can't understand the problem, what is wrong ??

[nano511]

I think its because **myarr does not hold a value. You need to set it to something (maybe). I am a noob to pointers but that is usually what that error means.

[dcftci]

but I did set it to zero in the consructor