Dynamic allocation of two dimensional array

I am having trouble set the pointer to a two dimensional array. I have seen example of one
dimensional array but not two. This is what I am
Working with. Oh you can email me at lorindia@earthlink.net if you have a solution.

double factor;
double HalfArray[30][41];


ifstream infile(path2, ios::binary | ios::in);
if(!infile) cout << " Array HalfArray not built" <<
endl;
for(i = 0; i < 30; i++) {
for(j = 0; j < 41; j++){
infile.read((char*)&factor, sizeof(factor));
HalfArray[j] = factor;
}//End of J loop
}//End of I loop

This do not work
double HalfArray[30][41];
double *Half = HalfArray;
Or
Double *Half = new Double[30][41];