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try this code. i think it shows you a simpler way.

#include "highgui.hpp"

using namespace cv;
using namespace std;

int main( int argc, char** argv )
{
    vector<double> testVector;

    for( int i = 0; i < 65536; i++)
    {
        testVector.push_back( i % 256 );
    }

    Mat testMat = Mat( testVector ).reshape( 0, 256 );

    testMat.convertTo( testMat, CV_8UC1 );

    imshow("testMat",testMat);
    waitKey();
}