Convert std::vector<double> to Mat and show the image

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I have a std::vector<double> which contains pixel values calculated from somewhere else. Now I want to convert this to a Mat type and show it. But I faced some problems...only some part of the resulted image looks find and the rest seems to be corrupted. Can you please tell me what am I doing wrong?

Here is my code:

void convertMeanVectorToImageAndShow(cv::Size size, int type
                                     , PedRec::mean_vector *vector
                                     , QString windowName) {

    cv::Mat mat;
    mat.create(size.height, size.width, type);

    int rows = mat.rows;
    int cols = mat.cols;

    if (mat.isContinuous()) {
        cols = rows*cols;
        rows = 1;
    } 

    for (int r = 0; r < rows; ++r)
    {
        uchar *pOutput = mat.ptr<uchar>(r);

        for (int c = 0; c < cols; ++c)
        {
            *pOutput = (uchar)vector->at(c);
            ++pOutput;
        }
    }

    cv::imshow(windowName.toStdString(), mat);
}

UPDATE Thanks to @theodore , now I at least get a non-corrupted image.

uchar pv[vector->size()];
for(unsigned int i = 0; i < vector->size(); i++) {
    pv[i] = (uchar) vector->at(i);
}

cv::Mat out(size, CV_8UC1);
memcpy(out.data, &pv, vector->size());

cv::imshow(windowName.toStdString(), out);

But it is different than what I expect. In fact what I am doing is getting the mean value of 6000 pedestrian images and the resulted image should at least in theory look like a pedestrian. But this is what I get:

If you compare this with what I had in the begging of my question, this does not look like a pedestrain. the top of the my first image looks like a head and body of a pedestrian. I guess there is something wrong with the type CV_8UC1 ? because my original images are pmg GrayScale. for example:

Type of these images are (int) 16