why composeRT function is showing error for column vectors?

edit

So I'm basically try to get the combination of two rotation and translation transformations.

Mat rvec1(1,3,CV_32F);
rvec1.at<double>(0,0) = 2.3;
rvec1.at<double>(0,1) = 4.5;
rvec1.at<double>(0,2) = 7.8;

Mat rvec2(1,3,CV_32F);
rvec2.at<double>(0,0) = 2.1;
rvec2.at<double>(0,1) = 4;
rvec2.at<double>(0,2) = 1.2;

Mat tvec1(1,3,CV_32F);
tvec1.at<double>(0,0) = 4;
tvec1.at<double>(0,1) = 2;
tvec1.at<double>(0,2) = 3;

Mat tvec2(1,3,CV_32F);
tvec2.at<double>(0,0) = 2;
tvec2.at<double>(0,1) = 3;
tvec2.at<double>(0,2) = 13;

Mat rvec3,tvec3;

//-> Calling composeRT function
composeRT(rvec1, tvec1, rvec2, tvec2, rvec3, tvec3);

But i'm getting this error- OpenCV Error: Assertion failed (_rvec1->rows == 3 && _rvec1->cols == 1 && CV_ARE_SIZES_EQ(_rvec1, _rvec2)) in cvComposeRT, file /home/kevmepls/opencv-2.4.9/modules/calib3d/src/calibration.cpp, line 407 terminate called after throwing an instance of 'cv::Exception' what(): /home/kevmepls/opencv-2.4.9/modules/calib3d/src/calibration.cpp:407: error: (-215) _rvec1->rows == 3 && _rvec1->cols == 1 && CV_ARE_SIZES_EQ(_rvec1, _rvec2) in function cvComposeRT

Aborted (core dumped)

If i make the inputs as row vectors, then no errors arises. So why is error coming when inputs are column vectors?