base_plots.py 文件源码

def x_frame2D(X, plot_limits=None, resolution=None):
    """
    Internal helper function for making plots, returns a set of input values to plot as well as lower and upper limits
    """

    assert X.shape[1] == 2, \
        'x_frame2D is defined for two-dimensional inputs'
    if plot_limits is None:
        (xmin, xmax) = (X.min(0), X.max(0))
        (xmin, xmax) = (xmin - 0.2 * (xmax - xmin), xmax + 0.2 * (xmax
                        - xmin))
    elif len(plot_limits) == 2:
        (xmin, xmax) = plot_limits
    else:
        raise ValueError, 'Bad limits for plotting'

    resolution = resolution or 50
    (xx, yy) = np.mgrid[xmin[0]:xmax[0]:1j * resolution, xmin[1]:
                        xmax[1]:1j * resolution]
    Xnew = np.vstack((xx.flatten(), yy.flatten())).T
    return (Xnew, xx, yy, xmin, xmax)