from typing import List


def list_to_str(x: List[float]) -> str:
    """ Produces a string of formatted floating point numbers.

    Args:

        x: List of floating point numbers

    Returns:

        s: The formatted string.

    """

    strs = ''
    for x_i in x:
        strs += '{:.2e}, '.format(x_i)

    return strs[0:-2]