<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def fast_matrix_copy(f, t=None, n_threads=1):
 """ Not any faster than a serial copy so far. """

    if not f.flags['F_CONTIGUOUS']:
        raise RuntimeError(
            'This will not be fast unless input array f is Fortran-contiguous.')

    if t is None:
        t = asmatrix(empty(f.shape, order='F'))
    elif not t.flags['F_CONTIGUOUS']:
        raise RuntimeError(
            'This will not be fast unless input array t is Fortran-contiguous.')

    # Figure out how to divide job up between threads.
    dcopy_wrap(ravel(asarray(f.T)), ravel(asarray(t.T)))
    return t