Mat中数据指针的使用

		int righ = 0;
		for ( int k = 0; k < 200; k++)
		{
			pdata = (double*)arr.data + k * arr.step / sizeof(double);
			for ( int j = 0; j < 128; j++)
			{
				if ( *(pdata+j) == arr.at<double>(k, j) )
					righ++;
			}
			cout<<righ;
			righ = 0;
		}