how can i convert a vector of float into mat image

edit

i i need to convert vector of float to mat image then use this image in imgshow and resize function i have this function but it doesn't work

   memcpy(lbp.data,Vtrn.data(),Vtrn.size()*sizeof(float)); 
    resize(lbp, lbp, cvSize(50, 50),100,100,1); //in order to make all image same size
    imwrite(In.vectorofotrainpath[i].c_str(),lbp);// true with mat image or not

i have this error

   Windows has triggered a breakpoint in mycode.exe.
  This may be due to a corruption of the heap, which indicates a bug in mycode.exe or any of the DLLs it has loaded.

  This may also be due to the user pressing F12 while mycode.exe has focus.

the vector i want to convert is the histograms vector i obtained from this function

vector<float> spatialhist::spatialHistogramforknnorsvm( const Mat& lbpImage, const Size& grid)
{
    vector<float> histograms;
    histograms.resize(grid.width*grid.height*sizeb);
     int width=lbpImage.cols/grid.width;
    int height=lbpImage.rows/grid.height;
    int cnt=0;
    vector<Mat> histogramsimage;
    //#pragma omp parallel for
for(int i=0;i<grid.height;i++)
{
    for(int j=0;j<grid.width;j++)
    {
        Mat cell=lbpImage(Rect(j*width,i*height,width,height));
        Mat cell_hist=computeHistogram(cell);
        histogramsimage.push_back(cell_hist);
        //imshow("FFF",cell_hist);

        Mat tmp_feature;
       Mat feature =cell_hist.reshape(1,1);
        feature.convertTo(tmp_feature,CV_32FC1);

        float * ptr=tmp_feature.ptr<float>(0);
        for(int k=0;k<tmp_feature.cols-1;k++)
        {
            if(ptr[k]==0)
                ptr[k]=1.0/sizeb;
            histograms[(cnt*sizeb)+k]=ptr[k];
          //  cerr << ptr[k] << endl;
        }
        cnt++;
    }

}


return histograms;
}