plot.py 文件源码

def plot2D_samples_mat(xs, xt, G, thr=1e-8, **kwargs):
    """ Plot matrix M  in 2D with  lines using alpha values

    Plot lines between source and target 2D samples with a color
    proportional to the value of the matrix G between samples.


    Parameters
    ----------
    xs : ndarray, shape (ns,2)
        Source samples positions
    b : ndarray, shape (nt,2)
        Target samples positions
    G : ndarray, shape (na,nb)
        OT matrix
    thr : float, optional
        threshold above which the line is drawn
    **kwargs : dict
        paameters given to the plot functions (default color is black if
        nothing given)
    """
    if ('color' not in kwargs) and ('c' not in kwargs):
        kwargs['color'] = 'k'
    mx = G.max()
    for i in range(xs.shape[0]):
        for j in range(xt.shape[0]):
            if G[i, j] / mx > thr:
                pl.plot([xs[i, 0], xt[j, 0]], [xs[i, 1], xt[j, 1]],
                        alpha=G[i, j] / mx, **kwargs)