Load cv triangulate points()

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Hi everyone,

I am working on cv triangulatepoints(). I have keypoint values and projection matrix and I did tringulation using opencv function. But I could not able to load the points to point3d variable. I am getting error at double w = out.at<double>(3,0);. I am trying to take x,y,z axis for one keypoint out of my 383 keypoints. Can anyone please suggest me.

int N = inp1.size();
cv::Mat out = cv::Mat(4,N, CV_64FC1);
cv::triangulatePoints( P, P1, inp1, inp2, out);
"out = " << out << endl;
w = out.at<double>(3,0);
x = out.at<double>(0,0)/w;
y = out.at<double>(1,0)/w;
z = out.at<double>(2,0)/w;
push_back(cv::Point3f(x,y,z));