Python pyplot.get_cmap函数代码示例

def show_grid(grid, start, person, maxdiv):
    fig = plt.figure(3)

    vmin = None#np.min(grid)
    vmax = None#np.max(grid)/maxdiv
    cmap_name = 'inferno'

    print(grid.shape, vmin, vmax)

    for i in range(grid.shape[1]):
        print(i, np.sum(grid[:,i,:]))

    for i in range(9):
        a = fig.add_subplot(2,5,i+1)
        plt.imshow(grid[:,start+i,:], cmap=plt.get_cmap(cmap_name), vmin=vmin, vmax=vmax, interpolation='nearest')
        a.set_title(str(start+i))

    fig = plt.figure(30)
    a = fig.add_subplot(1,1,1)
    tmp = np.sum(grid[:,person,:], axis=1)/np.max(grid)

    vmin = np.min(tmp)
    vmax = np.max(tmp)/maxdiv
    print(vmin, vmax)
    plt.imshow(tmp, cmap=plt.get_cmap(cmap_name), vmin=vmin, vmax=vmax, interpolation='nearest')
    a.set_title('cost')

def plot_color_gradients(cmap_category, cmap_list):
    nrows = len(cmap_list)
    fig, axes = plt.subplots(nrows=nrows, ncols=2)
    fig.subplots_adjust(top=0.95, bottom=0.01, left=0.2, right=0.99, wspace=0.05)
    fig.suptitle(cmap_category + " colormaps", fontsize=14, y=1.0, x=0.6)

    for ax, name in zip(axes, cmap_list):

        # Get rgb values for colormap
        rgb = cm.get_cmap(plt.get_cmap(name))(x)[np.newaxis, :, :3]

        # Get colormap in CAM02-UCS colorspace. We want the lightness.
        lab = cspace_converter("sRGB1", "CAM02-UCS")(rgb)
        L = lab[0, :, 0]
        L = np.float32(np.vstack((L, L, L)))

        ax[0].imshow(gradient, aspect="auto", cmap=plt.get_cmap(name))
        ax[1].imshow(L, aspect="auto", cmap="binary_r", vmin=0.0, vmax=100.0)
        pos = list(ax[0].get_position().bounds)
        x_text = pos[0] - 0.01
        y_text = pos[1] + pos[3] / 2.0
        fig.text(x_text, y_text, name, va="center", ha="right", fontsize=10)

    # Turn off *all* ticks & spines, not just the ones with colormaps.
    for ax in axes:
        ax[0].set_axis_off()
        ax[1].set_axis_off()
    plt.show()

def plot_images_with_probabilities(images, predictiondistribution):
    """ Show images along with their predicted distribution
    INPUT:
        images: the images
        predictiondistribution: the output distribution of the network
    """
    assert images.shape[0] == predictiondistribution.shape[0], "Number of images does not match the amount of prediction labels"
    assert images.shape[0] <= 20, "Can't show more than 20 images"

    fig, axarr = plt.subplots(images.shape[0], 2)
    for i in range(0, images.shape[0], ):
        #Plot the image itself
        ax = axarr[i,0]
        ax.imshow(images[i,:,:],
            cmap=plt.get_cmap("gray_r"),
            interpolation="none")
        ax.axis("off")

        #Plot the probability distribution
        ax = axarr[i,1]
        ax.imshow(np.expand_dims(predictiondistribution[i,:], 0),
            cmap=plt.get_cmap("gray"),
            interpolation="none",
            vmin=0,
            vmax=1)
        ax.axes.get_xaxis().set_ticks(np.arange(10))
        ax.axes.get_yaxis().set_ticks([])

    plt.show()

def demo_bottom_cbar(fig):
    """
    A grid of 2x2 images with a colorbar for each column.
    """
    grid = AxesGrid(fig, 121, # similar to subplot(132)
                    nrows_ncols = (2, 2),
                    axes_pad = 0.10,
                    share_all=True,
                    label_mode = "1",
                    cbar_location = "bottom",
                    cbar_mode="edge",
                    cbar_pad = 0.25,
                    cbar_size = "15%",
                    direction="column"
                    )

    Z, extent = get_demo_image()
    cmaps = [plt.get_cmap("autumn"), plt.get_cmap("summer")]
    for i in range(4):
        im = grid[i].imshow(Z, extent=extent, interpolation="nearest",
                cmap=cmaps[i//2])
        if i % 2:
            cbar = grid.cbar_axes[i//2].colorbar(im)

    for cax in grid.cbar_axes:
        cax.toggle_label(True)
        cax.axis[cax.orientation].set_label("Bar")

    # This affects all axes as share_all = True.
    grid.axes_llc.set_xticks([-2, 0, 2])
    grid.axes_llc.set_yticks([-2, 0, 2])

    def test_linestrings_values(self):
        from geopandas.plotting import plot_linestring_collection

        fig, ax = plt.subplots()

        # default colormap
        coll = plot_linestring_collection(ax, self.lines, self.values)
        fig.canvas.draw_idle()
        cmap = plt.get_cmap()
        expected_colors = cmap(np.arange(self.N) / (self.N - 1))
        _check_colors(self.N, coll.get_color(), expected_colors)
        ax.cla()

        # specify colormap
        coll = plot_linestring_collection(ax, self.lines, self.values,
                                          cmap='RdBu')
        fig.canvas.draw_idle()
        cmap = plt.get_cmap('RdBu')
        expected_colors = cmap(np.arange(self.N) / (self.N - 1))
        _check_colors(self.N, coll.get_color(), expected_colors)
        ax.cla()

        # specify vmin/vmax
        coll = plot_linestring_collection(ax, self.lines, self.values,
                                          vmin=3, vmax=5)
        fig.canvas.draw_idle()
        cmap = plt.get_cmap()
        expected_colors = cmap([0])
        _check_colors(self.N, coll.get_color(), expected_colors)
        ax.cla()

def main():
    x, y, z = load_data()
    print(z.shape)

    # Fit a 3rd order, 2d polynomial
    m = polyfit2d(x, y, z)

    # Evaluate it on a grid...
    nx, ny = 20, 20
    xx, yy = np.meshgrid(np.linspace(x.min(), x.max(), nx),
                         np.linspace(y.min(), y.max(), ny))
    zz = polyval2d(xx, yy, m)

    # Plot
    plt.imshow(zz,
               origin='lower',
               cmap=plt.get_cmap('hot'),
               extent=[eta_min, eta_max, xi_min, xi_max],
               aspect='auto')
    m = cm.ScalarMappable(cmap=plt.get_cmap('hot'))
    m.set_array(z)
    plt.colorbar(m, label='memory capacity', ticks=[30, 40, 50, 60, 70, 80, 90, 100])
    plt.xlabel(r'$\eta$', size=24)
    plt.ylabel(r'$\xi$', size=24)
    plt.savefig('eta_xi_mc_sampled.png')
    plt.show()

def plot_corrcoef_raftscope(raftsfits, ROIrows, ROIcols, xylabels=None, title='', norm=True):
    """
    Plot of correlation coefficients over list of CCD images.
    :param raftsfits:
    :param ROIrows: must be in the format: slice(start, stop)
    :param ROIcols: must be in the format: slice(start, stop)
    :param norm: if True, computes correlation coefficients; if not, returns covariances
    :return:
    """
    datadir, dataname = os.path.split(raftsfits[0])
    dataname = os.path.splitext(dataname)[0]

    a = corrcoef_raftscope(raftsfits, ROIrows, ROIcols, norm)
    fig, ax = plt.subplots(figsize=(10, 8))
    if norm:
        cax = ax.imshow(a, cmap=plt.get_cmap('jet'), norm=mplcol.Normalize(vmax=1, clip=True), interpolation='nearest')
    else:
        cax = ax.imshow(a, cmap=plt.get_cmap('jet'), norm=mplcol.Normalize(vmax=20000, clip=True), interpolation='nearest')
    if norm:
        titlestr = "Correlation for %s"
    else:
        titlestr = "Covariances for %s"
    if title:
        ax.set_title(titlestr % title)
    else:
        ax.set_title(titlestr % dataname)
    ax.set_xticks(np.arange(0, 16*len(raftsfits), 16))
    ax.set_yticks(np.arange(0, 16*len(raftsfits), 16))
    if xylabels:
        ax.set_xticklabels(xylabels)
        ax.set_yticklabels(xylabels)
    cbar = fig.colorbar(cax, orientation='vertical')

    plt.savefig(os.path.join(datadir, "corrscope-%s.png" % dataname))
    plt.show()

def Plot_Gen_Mass_Density(data_file='filtered_data'):
    '''
    Create a interpolated plot where the colors of the line
    correspond to the mass transfer rate of the data

    Parameters
    ----------
    data_file : str
        file to be used to generate the  plot
    '''

    try:
        filtered_results = np.loadtxt(data_file)
    except:
        root_dir = raw_input("file not found, select directory to generate: ")
        filtered_results = mesa_calc.Gen_Filtered_Data_File(root_dir=root_dir)

    filtered_period = filtered_results[:, 1]
    filtered_mtransfer = filtered_results[:, 3]
    filtered_mass1 = filtered_results[:, 4]
    filtered_run_num = filtered_results[:, 13]

    split_ind = np.where(filtered_run_num != 0)[0]
    split_mass1 = np.split(filtered_mass1, split_ind)
    split_period = np.split(filtered_period, split_ind)
    split_mtransfer = np.split(filtered_mtransfer, split_ind)

    plt.figure(1, figsize=(24, 13.5))  # 1920x1080
    plt.clf()

    if xrange(len(split_mass1)):
        for sys_number in xrange(len(split_mass1)):
            Plot_Color_Line(split_mass1[sys_number],
                            split_period[sys_number],
                            z=split_mtransfer[sys_number],
                            cmap=plt.get_cmap('jet'),
                            norm=plt.Normalize(-12, max(filtered_mtransfer)))
    else:
        Plot_Color_Line(split_mass1[0],
                        split_period[0],
                        z=split_mtransfer[0],
                        cmap=plt.get_cmap('jet'),
                        norm=plt.Normalize(-12, max(filtered_mtransfer)))

    sm = plt.cm.ScalarMappable(cmap=plt.get_cmap('jet'),
                               norm=plt.Normalize(-12, max(filtered_mtransfer)))
    sm._A = []
    cb = plt.colorbar(sm)
    cb.set_label(r'log$(\dot{M})$', size=20)

    plt.xlabel(r'Donor Mass $(\dot{M_\odot})$', fontsize=20)
    plt.ylabel(r'Period log(days)', fontsize=20)
    plt.xlim(min(filtered_mass1) - 0.2, max(filtered_mass1) + 0.2)
    plt.ylim(min(filtered_period) - 0.2, max(filtered_period) + 0.2)
    plt.tick_params(axis='both', which='major', labelsize=20)
    plt.grid()

    figname = 'dt_mass_period'
    plt.savefig(figname)
    plt.show()

    def heat_map(self, cmap="RdYlGn", vmin=None, vmax=None, font_cmap=None):
        if cmap is None:
            carr = ["#d7191c", "#fdae61", "#ffffff", "#a6d96a", "#1a9641"]
            cmap = LinearSegmentedColormap.from_list("default-heatmap", carr)

        if isinstance(cmap, str):
            cmap = get_cmap(cmap)
        if isinstance(font_cmap, str):
            font_cmap = get_cmap(font_cmap)

        vals = self.actual_values.astype(float)
        if vmin is None:
            vmin = vals.min().min()
        if vmax is None:
            vmax = vals.max().max()
        norm = (vals - vmin) / (vmax - vmin)
        for ridx in range(self.nrows):
            for cidx in range(self.ncols):
                v = norm.iloc[ridx, cidx]
                if np.isnan(v):
                    continue
                color = cmap(v)
                hex = rgb2hex(color)
                styles = {"BACKGROUND": HexColor(hex)}
                if font_cmap is not None:
                    styles["TEXTCOLOR"] = HexColor(rgb2hex(font_cmap(v)))
                self.iloc[ridx, cidx].apply_styles(styles)
        return self

def DisplayFrames(video):
    num_rows = np.shape(video)[0]
    num_cols = np.shape(video)[1]
    num_frames = np.shape(video)[2]
    
    f = 0
    plt.imshow(video[:,:,f], cmap=plt.get_cmap('gray'))
    plt.show(block=False)
    while(True):
        f = 0
        print("\033[A                                           \033[A")
        x = input("Press f: forward, b: back, q: quit  :  ")
        if (x == "f"):
            if ((f+1) < num_frames):
                f = f+1
        elif (x == "b"):
            if ((f-1) >= 0):
                f = f-1
        elif (x == "q"):
            break
        else:
            f = f

        plt.imshow(video[:,:,f], cmap=plt.get_cmap('gray'))
        plt.show(block=False)

def plot_coo_matrix(m):
    if not isinstance(m, coo_matrix):
        m = coo_matrix(m)
    fig = plt.figure()
    ax = fig.add_subplot(111, axisbg='black')
    #print m.data
    #print len(m.col), len(m.row), len(m.data)

    cdata = array2cmap(m.data, -10, 10)
    cmhot = plt.get_cmap("hot")
    dgray = plt.get_cmap('gray') 
    #cnorm  = colors.Normalize(vmin=-10, vmax=10)

    #ax.scatter(m.col, m.row, c=m.data, cmap=cmhot)
    ax.plot(m.col, m.row, 's', c="white", ms=1)
    ax.set_xlim(0, m.shape[1])
    ax.set_ylim(0, m.shape[0])
    ax.set_aspect('equal')
    for spine in ax.spines.values():
        spine.set_visible(False)
    ax.invert_yaxis()
    ax.set_aspect('equal')
    ax.set_xticks([])
    ax.set_yticks([])
    return ax

    def _plot_2D(self, ax=None, plot_3D=True, **kwargs):
        fig = plt.gcf()
        if ax is None:
            if plot_3D:
                print HEEEEEEE
                ax = fig.add_subplot(111, projection='3d')
            else:
                print HEYEHYE
                ax = fig.add_subplot(111)

        if hasattr(self,'probs'):
            del self.probs
        if not hasattr(self.softmax_collection, 'probs'):
            self.softmax_collection.probability()

        X = self.softmax_collection.X
        Y = self.softmax_collection.Y
        Z = self.softmax_collection.probs[:, self.id].reshape(X.shape[0], X.shape[1])
        bounds = self.softmax_collection.bounds

        if plot_3D:
            ax.plot_surface(X, Y, Z, cstride=2, rstride=2, linewidth=0,
                            antialiased=False, cmap=plt.get_cmap(self.cmap))

            ax.set_zlabel('Probability P(D=i|X)')
        else:
            levels = np.linspace(0, np.max(Z), 50)
            ax.contourf(X, Y, Z, levels=levels, cmap=plt.get_cmap(self.cmap),
                        alpha=0.8)

        ax.set_xlim(bounds[0], bounds[2])
        ax.set_ylim(bounds[1], bounds[3])
        ax.set_xlabel('x')
        ax.set_ylabel('y')
        ax.set_title('Class Probabilities')

    def gradient(figure_object, axis_object, xs, ys, start_year, TWP_length, cmap, key_count):
        """Based on http://matplotlib.org/examples/pylab_examples/multicolored_line.html
        and http://stackoverflow.com/questions/19132402/set-a-colormap-under-a-graph
        """
        from matplotlib.collections import LineCollection

        # plot a color_map line fading to white
        points = np.array([xs, ys]).T.reshape(-1, 1, 2)
        segments = np.concatenate([points[:-1], points[1:]], axis=1)
        lc = LineCollection(segments, cmap=plt.get_cmap('gray'), norm=plt.Normalize(start_year, start_year+TWP_length),
                            linewidth=0.2, zorder=1)   # norm sets the color min:max range
        lc.set_array(np.array(xs))
        axis_object.add_collection(lc)

        # add fading color_map fill as well
        xs.append(max(xs))
        xs.append(min(xs))
        ys.append(0)
        ys.append(0)
        poly, = axis_object.fill(xs, ys, facecolor='none', edgecolor='none')
        img_data = np.arange(0, 100, 1)
        img_data = img_data.reshape(1, img_data.size)
        im = axis_object.imshow(img_data, aspect='auto', origin='lower', cmap=plt.get_cmap(cmap),
                                extent=[start_year+TWP_length, start_year, 1000, -1000], vmin=0., vmax=100., zorder=-(start_year+1)*key_count)
        im.set_clip_path(poly)

def createTrainingData(file = '/Users/oli/Proj_Large_Data/Deep_Learning_MRI/BRATS-2/brats2.h5', show=True):
    lnum = 0
    with h5py.File(file, 'r') as f:
        for name in f:
            t1c = np.asarray(f[name + '/' + 'VSD.Brain.XX.O.MR_T1c'])
            pred = np.asarray(f[name + '/' + 'VSD.Brain_3more.XX.XX.OT'])
            if show:
                fig = plt.figure()
                plt.title(name)
                plt.xticks([])
                plt.yticks([])
                plt.subplots_adjust(hspace=1e-3, wspace=1e-3)
            for i, z in enumerate(range(65, 145, 5)):
                tc1s = (np.array(t1c[z, 20:180, 0:160], dtype='float32')).reshape(1,1,160,160)
                preds = (np.array(pred[z, 20:180, 0:160], dtype='uint8')).reshape(1,1,160,160)
                if (lnum == 0):
                    X = tc1s
                    Y = preds
                else:
                    X = np.vstack((X, tc1s))
                    Y = np.vstack((Y, preds))
                if show:
                    a = fig.add_subplot(6, 6, (2 * i + 1), xticks=[], yticks=[])  # NB the one based API sucks!
                    plt.imshow(X[lnum,0,:,:], cmap=plt.get_cmap('gray'))
                    a = fig.add_subplot(6, 6, (2 * i + 2), xticks=[], yticks=[])  # NB the one based API sucks!
                    plt.imshow(Y[lnum,0,:,:], cmap=plt.get_cmap('gray'))
                lnum += 1
            if show:
                plt.pause(1)
    return X,Y

def plot_data(data,lon_data, lat_data, periodname, AODcatname,maptype,cmapname,minv=0,maxv=0,folder=""):
    fig = plt.figure()
    #ax = fig.add_axes([0.1,0.1,0.8,0.8])

    m = Basemap(llcrnrlon=19,llcrnrlat=34,urcrnrlon=29,urcrnrlat=42,
                resolution='h',projection='cass',lon_0=24,lat_0=38)

    nx = int((m.xmax-m.xmin)/1000.)+1
    ny = int((m.ymax-m.ymin)/1000.)+1
    topodat = m.transform_scalar(data,lon_data,lat_data,nx,ny)
    
    if minv<>0 or maxv<>0 :
        im = m.imshow(topodat,cmap=plt.get_cmap(cmapname),vmin=minv,vmax=maxv)
    else:
        im = m.imshow(topodat,cmap=plt.get_cmap(cmapname))
 

    m.drawcoastlines()
    m.drawmapboundary()
    m.drawcountries()
    m.drawparallels(np.arange(35,42.,1.), labels=[1,0,0,1])
    m.drawmeridians(np.arange(-20.,29.,1.), labels=[1,0,0,1])
    cb = m.colorbar(im,"right", size="5%", pad='2%')
    title=maptype+" AOD "+AODcatname+" "+periodname+" 2007-2014"
    plt.title(title)
    pylab.savefig(folder+maptype+"AOD"+AODcatname+"_"+periodname + ".png")