when create new Mat with multi-channels(i.e., 8) with the particular value(i.e. 0.9), it will raise error (error: (-215:Assertion failed) cn <= 4 in function 'scalarToRawData') about opencv HOT 3 OPEN

    /** @overload
    @param rows Number of rows in a 2D array.
    @param cols Number of columns in a 2D array.
    @param type Array type. Use CV_8UC1, ..., CV_64FC4 to create 1-4 channel matrices, or
    CV_8UC(n), ..., CV_64FC(n) to create multi-channel (up to CV_CN_MAX channels) matrices.
    @param s An optional value to initialize each matrix element with. To set all the matrix elements to
    the particular value after the construction, use the assignment operator
    Mat::operator=(const Scalar& value) .
    */
    Mat(int rows, int cols, int type, const Scalar& s);

cv::Mat &cv::Mat::setTo(cv::InputArray value, cv::InputArray mask = noArray())
Sets all or some of the array elements to the specified value. This is an advanced variant of the Mat::operator=(const Scalar& s) operator.