cv::format does not format the way it should.

edit

I started to use cv::format() a while ago to format my data in a CSV like text stream, and noticed it worked oddely : no problem of importance when used on a N * P cv::Mat where P is greater or equal to 2. The only matter then would be the useless spaces before each row but the first, but we can trim them afterwards easily.

But when P is equal to 1 (the matrix is a column), cv::format() does not seem to add the end of line signals between lines and I end up with a single line full of characters with no separation in between.

Here is an exemple, where I fill up two matrices and display them before and after using cv::format() :

#include <iostream>
#include "opencv2/opencv.hpp"

using namespace std;

int main()
{
  int dimensions = 5;
  int sampleCount = 4;

  cv::Mat points(sampleCount,dimensions, CV_32F,cv::Scalar(10));
  cout<<points<<endl;
  cout<<cv::format(points,"csv")<<endl;

  cv::Mat points2(sampleCount,1, CV_32F,cv::Scalar(10));
  cout<<points2<<endl;
  cout<<cv::format(points2,"csv")<<endl;

  return 0;
}

The output given is :

[10, 10, 10, 10, 10;
  10, 10, 10, 10, 10;
  10, 10, 10, 10, 10;
  10, 10, 10, 10, 10]
10, 10, 10, 10, 10
  10, 10, 10, 10, 10
  10, 10, 10, 10, 10
  10, 10, 10, 10, 10

[10; 10; 10; 10]
10101010

The extra spaces in the first case seem to come from the << operator which gives a nicer display since it displays a bracket on first line.

As for the second and most important case, I don't know where it comes from but I think this should be fixed.

Note the "csv" format seems not to be the only one with this kind of output, I tried with "python" and got a similar [10101010] output.