[nihadkarim]

I am trying to use following code, but it gives error. Error message is like : OpenCV Error: Assertion failed (dims <= 2 && data && (unsigned)i0 < (unsigned)si ze.p[0] && (unsigned)(i1DataType<_Tp>::channels) < (unsigned)(size.p[1]channel s()) && ((((sizeof(size_t)<<28)|0x8442211) >> ((DataType<_Tp>::depth) & ((1 << 3 ) - 1))*4) & 15) == elemSize1()) in unknown function, file c:\program files (x86 )\opencv2.2\include\opencv2\core\mat.hpp, line 517

My code is given below:

int main(.....)
{
vector<double>pdf_vector;
//read data from file and put it in pdf_vector.
vector<double>all_vector;
Mat dft_input_vector(pdf_vector);
Mat dft_output_vector;
dft(dft_input_vector, dft_output_vector);

for(i=0;i<1;i++)
{
   for(j=0;j<pdf_vector.size ();j++)
    {
      all_vector.push_back (dft_output_vector.at <float>(i,j));
    }   
}

.................
}

[nihadkarim]

Revised code would be

int main(.....)
{
vector<double>pdf_vector;
//read data from file and put it in pdf_vector.
vector<double>all_vector;
Mat dft_input_vector(pdf_vector);
Mat dft_output_vector;
dft(dft_input_vector, dft_output_vector);

for(i=0;i<pdf_vector.size ();i++)
{
   for(j=0;j<1;j++)
    {
      all_vector.push_back (dft_output_vector.at <double>(i,j));
    }   
}

.................
}

[Skydiver]

Have you checked each of the conditions of the assertion? Which one of them is not true?

I remind you again that OpenCV is "open source" you can look at the source code and see what it is doing. When the assertion fires, you can press break on the dialog, and inspect your variables with regards to the assertion.