Python pyplot.fill_between函数代码示例

def plotOverlapMatrix(O):
   """Plots the probability of observing a sample from state i (row) in state j (column).
   For convenience, the neigboring state cells are fringed in bold."""
   max_prob = O.max()
   fig = pl.figure(figsize=(K/2.,K/2.))
   fig.add_subplot(111, frameon=False, xticks=[], yticks=[])

   for i in range(K):
      if i!=0:
         pl.axvline(x=i, ls='-', lw=0.5, color='k', alpha=0.25)
         pl.axhline(y=i, ls='-', lw=0.5, color='k', alpha=0.25)
      for j in range(K):
         if O[j,i] < 0.005:
            ii = ''
         else:
            ii = ("%.2f" % O[j,i])[1:]
         alf = O[j,i]/max_prob
         pl.fill_between([i,i+1], [K-j,K-j], [K-(j+1),K-(j+1)], color='k', alpha=alf)
         pl.annotate(ii, xy=(i,j), xytext=(i+0.5,K-(j+0.5)), size=8, textcoords='data', va='center', ha='center', color=('k' if alf < 0.5 else 'w'))

   cx = sorted(2*range(K+1))
   cy = sorted(2*range(K+1), reverse=True)
   pl.plot(cx[2:-1], cy[1:-2], 'k-', lw=2.0)
   pl.plot(numpy.array(cx[2:-3])+1, cy[1:-4], 'k-', lw=2.0)
   pl.plot(cx[1:-2], numpy.array(cy[:-3])-1, 'k-', lw=2.0)
   pl.plot(cx[1:-4], numpy.array(cy[:-5])-2, 'k-', lw=2.0)

   pl.xlim(0, K)
   pl.ylim(0, K)
   pl.savefig('O_MBAR.pdf', bbox_inches='tight', pad_inches=0.0)
   pl.close(fig)
   return

def plot_validation_curve(model, X, y, scorer, param_name, param_range=np.linspace(0.1, 1, 5), cv=None, n_jobs=5,
    ylim=None, title="Xval. validation curve"):
    ''' Plot learning curve for model on data '''

    df = pd.DataFrame()
    df['param_range'] = param_range
    train_scores, test_scores = validation_curve(model, X, y, param_name=param_name, param_range=param_range,
        cv=cv, scoring=scorer, n_jobs=n_jobs)
    df['train_mean'] = 1 - np.mean(train_scores, axis=1)
    df['train_std'] = np.std(train_scores, axis=1)
    df['test_mean'] = 1 - np.mean(test_scores, axis=1)
    df['test_std'] = np.std(test_scores, axis=1)

    plt.figure()
    plt.title(title)
    if ylim is not None:
        plt.ylim(*ylim)
    plt.xlabel("Parameter value")
    plt.ylabel("Error (1-score)")
    plt.grid()
    plt.semilogx(param_range, df.train_mean, color="r", label="Training")
    plt.fill_between(param_range, df.train_mean - df.train_std, df.train_mean + df.train_std, alpha=0.1, color="r")
    plt.semilogx(param_range, df.test_mean, color="g", label="Test")
    plt.fill_between(param_range, df.test_mean - df.test_std, df.test_mean + df.test_std, alpha=0.1, color="g")
    plt.legend(loc="best")
    plt.show()
    return df, plt

    def _plot_scores(tuo_location_and_influence_score, marking_locations, no_of_bins_for_influence_score, smooth=True):
        figure = plt.figure()
        size = figure.get_size_inches()
        figure.set_size_inches( (size[0]*2, size[1]*0.5) )
        influence_scores = zip(*tuo_location_and_influence_score)[1]
        no_of_influence_scores = len(influence_scores)
        hist_influence_score, bin_edges_influence_score =  np.histogram(influence_scores, no_of_bins_for_influence_score)
        normed_hist_influence_score = map(lambda influence_score: (influence_score+0.)/no_of_influence_scores, hist_influence_score)
        bin_edges_influence_score = list(bin_edges_influence_score)
        normed_hist_influence_score = list(normed_hist_influence_score)
        bin_edges_influence_score=[bin_edges_influence_score[0]]+bin_edges_influence_score+[bin_edges_influence_score[-1]]
        normed_hist_influence_score=[0.0]+normed_hist_influence_score+[0.0]
        x_bin_edges_influence_score, y_normed_hist_influence_score = bin_edges_influence_score[:-1], normed_hist_influence_score
        if smooth: x_bin_edges_influence_score, y_normed_hist_influence_score = splineSmooth(x_bin_edges_influence_score, y_normed_hist_influence_score)
        plt.plot(x_bin_edges_influence_score, y_normed_hist_influence_score, lw=1, color='#FF9E05')
        plt.fill_between(x_bin_edges_influence_score, y_normed_hist_influence_score, color='#FF9E05', alpha=0.3)
        mf_neighbor_location_to_influence_score = dict(tuo_location_and_influence_score)
        for marking_location in marking_locations: 
            if marking_location in mf_neighbor_location_to_influence_score:
                print marking_location, mf_neighbor_location_to_influence_score[marking_location]
#                plt.scatter([mf_neighbor_location_to_influence_score[marking_location]], [0.0005], s=20, lw=0, color=GeneralMethods.getRandomColor(), alpha=1., label=marking_location)
                plt.scatter([mf_neighbor_location_to_influence_score[marking_location]], [0.0005], s=20, lw=0, color='m', alpha=1., label=marking_location)
            else: print marking_location
#                    plt.xlim(get_new_xlim(plt.xlim()))
#        plt.legend()
        (ticks, labels) = plt.yticks()
        plt.yticks([ticks[-2]])
        plt.ylim(ymin=0.0)
        return ticks[-1]

def plot_forecast(fc, data=None, test=None, loc='upper left'):
  '''
  Plots a forecast and its prediction intervals.
  
  Args:
    fc: Pandas Data Frame from converters.prediction_intervals,
      or an R forecast object
    data: the data for the forecast period as a Pandas Series, or None 
      if fc is an R forecast
    test: optional data for the forecast period as a Pandas Series
    loc: Default is 'upper left', since plots often go up and right.
      For other values see matplotlib.pyplot.legend().
      
  Output:
    a plot of the series, the mean forecast, and the prediciton intervals, 
    and optionally, the data for the forecast period, if provided,
  '''
  fc, data, test = converters.to_forecast(fc, data, test)
  plt.style.use('ggplot')
  l = list(fc.columns)
  lowers = l[1::2]
  uppers = l[2::2]
  tr_idx = converters.flatten_index(data.index)
  fc_idx = converters.flatten_index(fc.index)
  plt.plot(tr_idx, data, color='black')
  plt.plot(fc_idx, fc[l[0]], color='blue')
  for (k, (low, up)) in enumerate(zip(lowers, uppers), 1):
    plt.fill_between(fc_idx, fc[low], fc[up], color='grey', alpha=0.5/k)
  labels = ['data', 'forecast']
  if test is not None:
    n = min(len(fc.index), len(test))
    plt.plot(fc_idx[:n], list(test[:n]), color='green')
    labels.append('test')
  plt.legend(labels, loc=loc)
  plt.show()    

def plot_learning_curve(estimator, title, X, y, ylim=None, cv=None,
                        n_jobs=1, train_sizes=np.linspace(.1, 1.0, 5)):
    """
    source: http://scikit-learn.org/stable/auto_examples/plot_learning_curve.html

    Generate a simple plot of the test and traning learning curve.

    Parameters
    ----------
    estimator : object type that implements the "fit" and "predict" methods
        An object of that type which is cloned for each validation.

    title : string
        Title for the chart.

    X : array-like, shape (n_samples, n_features)
        Training vector, where n_samples is the number of samples and
        n_features is the number of features.

    y : array-like, shape (n_samples) or (n_samples, n_features), optional
        Target relative to X for classification or regression;
        None for unsupervised learning.

    ylim : tuple, shape (ymin, ymax), optional
        Defines minimum and maximum yvalues plotted.

    cv : integer, cross-validation generator, optional
        If an integer is passed, it is the number of folds (defaults to 3).
        Specific cross-validation objects can be passed, see
        sklearn.cross_validation module for the list of possible objects

    n_jobs : integer, optional
        Number of jobs to run in parallel (default 1).
    """
    plt.figure()
    plt.title(title)
    if ylim is not None:
        plt.ylim(*ylim)
    plt.xlabel("Training examples")
    plt.ylabel("Score")
    train_sizes, train_scores, test_scores = learning_curve(
        estimator, X, y, cv=cv, n_jobs=n_jobs, train_sizes=train_sizes)
    train_scores_mean = np.mean(train_scores, axis=1)
    train_scores_std = np.std(train_scores, axis=1)
    test_scores_mean = np.mean(test_scores, axis=1)
    test_scores_std = np.std(test_scores, axis=1)
    plt.grid()

    plt.fill_between(train_sizes, train_scores_mean - train_scores_std,
                     train_scores_mean + train_scores_std, alpha=0.1,
                     color="r")
    plt.fill_between(train_sizes, test_scores_mean - test_scores_std,
                     test_scores_mean + test_scores_std, alpha=0.1, color="g")
    plt.plot(train_sizes, train_scores_mean, 'o-', color="r",
             label="Training score")
    plt.plot(train_sizes, test_scores_mean, 'o-', color="g",
             label="Cross-validation score")

    plt.legend(loc="best")
    return plt

    def plot_layer(self, layer):
        layer = {k: v for k, v in layer.items() if k in self.VALID_AES}
        layer.update(self.manual_aes)

        if 'x' in layer:
            x = layer.pop('x')
        if 'y' in layer:
            y = layer.pop('y')
        if 'se' in layer:
            se = layer.pop('se')
        else:
            se = None
        if 'span' in layer:
            span = layer.pop('span')
        else:
            span = 2/3.
        if 'method' in layer:
            method = layer.pop('method')
        else:
            method = None

        if method == "lm":
            y, y1, y2 = smoothers.lm(x, y)
        elif method == "ma":
            y, y1, y2 = smoothers.mavg(x, y)
        else:
            y, y1, y2 = smoothers.lowess(x, y)
        idx = np.argsort(x)
        x = np.array(x)[idx]
        y = np.array(y)[idx]
        y1 = np.array(y1)[idx]
        y2 = np.array(y2)[idx]
        plt.plot(x, y, **layer)
        if se==True:
            plt.fill_between(x, y1, y2, alpha=0.2, color="grey")

def ModelComplexity(X, y):
    """ Calculates the performance of the model as model complexity increases.
    The learning and testing errors rates are then plotted. """
                    
    # Create 10 cross-validation sets for training and testing
    cv = ShuffleSplit(X.shape[0], n_iter = 10, test_size = 0.2, random_state = 0)

    # Calculate the training and testing scores
    #alpha_range = np.logspace(0.1, 1,num = 10, base = 0.1)
    alpha_range = np.arange(0.1, 1, 0.1)
    train_scores, test_scores = curves.validation_curve(Ridge(), X, y, \
         param_name = "alpha", param_range = alpha_range, cv = cv, scoring = 'r2')

    # Find the mean and standard deviation for smoothing
    train_mean = np.mean(train_scores, axis=1)
    train_std = np.std(train_scores, axis=1)
    test_mean = np.mean(test_scores, axis=1)
    test_std = np.std(test_scores, axis=1)

    # Plot the validation curve
    pl.figure(3)
    pl.title('LinearRegression Complexity Performance')
    pl.plot(alpha_range, train_mean, 'o-', color = 'r', label = 'Training Score')
    pl.plot(alpha_range,test_mean, 'o-', color = 'g', label = 'Validation Score')
    pl.fill_between(alpha_range, train_mean - train_std, \
        train_mean + train_std, alpha = 0.15, color = 'r')
    pl.fill_between(alpha_range, test_mean - test_std, \
    test_mean + test_std, alpha = 0.15, color = 'g')
    
    # Visual aesthetics
    pl.legend(loc = 'lower right')
    pl.xlabel('alpha_range')
    pl.ylabel('Score')
    pl.ylim([0.5000,1.0000])
    pl.show()

def plot_noisy_means(graph_title, means, bands, series, xvals=None, xlabel=None, ylabel=None, subtitle=None, data=None, filename='results.pdf'):
    colors = ['blue','red','green', 'black', 'orange', 'purple', 'brown', 'yellow'] # max 8 lines
    assert(means.shape == bands.shape)
    assert(xvals is None or xvals.shape[0] == means.shape[1])
    assert(means.shape[0] <= len(colors))
    if xvals is None:
        xvals = np.arange(means.shape[0])
    ax = plt.axes([.1,.1,.8,.7])
    plt.ticklabel_format(axis='y', style='plain', useOffset=False)
    for i,mean in enumerate(means):
        plt.plot(xvals, mean, label=series[i], color=colors[i])
        plt.fill_between(xvals, mean + bands[i], mean - bands[i], facecolor=colors[i], alpha=0.2)
    if xlabel is not None:
        plt.xlabel(xlabel)
    if ylabel is not None:
        plt.ylabel(ylabel)
    if subtitle is not None:
        plt.figtext(.40,.9, graph_title, fontsize=18, ha='center')
        plt.figtext(.40,.85, subtitle, fontsize=10, ha='center')
    else:
        plt.title('{0}'.format(graph_title))
    # Shink current axis by 20%
    box = ax.get_position()
    ax.set_position([box.x0, box.y0, box.width * 0.8, box.height])
    # Put a legend to the right of the current axis
    ax.legend(loc='center left', bbox_to_anchor=(1, 0.5), fontsize=12)
    plt.savefig(filename)
    plt.clf()

def run_test():
    #x = np.array([0.0,.1,.2,.4,.75,.9,1.])
    #x = np.array([0.0,0.1,0.2,0.3,0.4,0.5,0.7,0.8,0.9,0.95,1.0,0.6])
    #x = np.linspace(0,1,10)
    x = np.array([0, 0.2, 0.4, 0.6, 0.8, 1.0])
    y = np.array([func(_x) for _x in x])
    xp = np.linspace(0,1,100)
    yp = func(xp)

    krig = Kriging1D(x,y)
    rbf = Rbf(x,y)
    xk = np.linspace(0,1,100)
    yk = np.zeros(len(xk))
    yr = np.zeros(len(xk))
    dk = np.zeros(len(xk))
    for i,xx in enumerate(xk):
        yk[i],dk[i] = krig(xx)
        yr[i] = rbf(xx)

    print sum(dk)
    plt.figure(1)
    plt.title('Kriging test')
    plt.hold(True)
    plt.plot(x,y,'rs')
    plt.plot(xp,yp,'b-')
    plt.plot(xk,yk,'r-')
    #plt.plot(xk,yr,'g-')
    plt.fill_between(xk,yk+0.5*dk,yk-0.5*dk,color='#dddddd')
    plt.grid(True)
    plt.axis([0,1,-10,20])
    plt.legend(['sample point','exact function','kriging'],'upper left')
    #plt.legend(['sample point','exact function','kriging','rbf'],'upper left')
    plt.show()

def plot_prior_1D(Xtest, test_cov, Ytest=None):

	# Manipulate X for plotting 
	X = np.hstack(Xtest)

	# Set prior mean function
	mean = np.zeros(Xtest.shape)

	s = np.sqrt(np.diag(test_cov))
	mean = np.reshape(mean, (-1,))
		     
	# Plot true function, mean function and uncertainty   
	ax1 = plt.subplot(211)
	plt.xlim(min(X), max(X))
	plt.ylim(min(mean-(2*s)-(s/2)), max(mean+(2*s)+(s/2)))       

	if Ytest is not None:
		plt.plot(X, Ytest, 'b-', label='Y')
	plt.plot(X, mean, 'r--', lw=2, label='mean')
	plt.fill_between(X, mean-(2*s), mean+(2*s), color='#87cefa')
	plt.legend()
	
	# Plot draws from prior
	mean = mean.reshape(X.shape[0],1)
	f = mean + np.dot(test_cov, np.random.normal(size=(X.shape[0],10)))
	ax2 = plt.subplot(212, sharex=ax1)
	plt.plot(X, f)
	plt.title('Ten samples')
	plt.tight_layout()
	plt.show() 

def plot_posterior_1D(Xtest, Xtrain, Ytrain, p_mean, p_sd, cov_post, Ytest=None): 
		
	# Manipulate data for plotting
	mean_f = p_mean.flat
	p_sd = np.reshape(p_sd, (-1,))
	Xtest = np.hstack(Xtest)
		
	# Plot true function, predicted mean and uncertainty (2s), and training points
	ax1 = plt.subplot(211)
	plt.plot(Xtrain, Ytrain, 'r+', ms=20) # training points
	plt.xlim(min(Xtest), max(Xtest))
	plt.ylim(min(mean_f-(2*p_sd)-(p_sd/2)), max(mean_f+(2*p_sd)+(p_sd/2))) 
 	if Ytest is not None:      
		plt.plot(Xtest, Ytest, 'b', label='Y') # true function
	plt.plot(Xtest, mean_f, 'r--', lw=2, label='mean') # mean function
	plt.fill_between(Xtest, mean_f-(2*p_sd), mean_f+(2*p_sd), color='#87cefa') # uncertainty
	plt.legend()
		
	# Plot 10 draws from posterior
	f = p_mean + np.dot(cov_post, np.random.normal(size=(Xtest.shape[0],10)))
	ax2 = plt.subplot(212, sharex=ax1)
	plt.xlim(min(Xtest), max(Xtest))
	plt.plot(Xtest, f)
	plt.plot(Xtrain, Ytrain, 'r+', ms=20) # new points
	plt.title('Ten samples')
	plt.tight_layout()
	plt.show()

def plot_learning_curve(estimator, title, X, y, ylim=None, cv=None, n_jobs=1, train_sizes=np.linspace(0.1, 1.0, 5)):
    plt.figure()
    plt.title(title)
    if ylim is not None:
        plt.ylim(*ylim)
    plt.xlabel("Training examples")
    plt.ylabel("Score")
    train_sizes, train_scores, test_scores = learning_curve(
        estimator, X, y, cv=cv, n_jobs=n_jobs, train_sizes=train_sizes
    )
    train_scores_mean = np.mean(train_scores, axis=1)
    train_scores_std = np.std(train_scores, axis=1)
    test_scores_mean = np.mean(test_scores, axis=1)
    test_scores_std = np.std(test_scores, axis=1)
    plt.grid()

    plt.fill_between(
        train_sizes, train_scores_mean - train_scores_std, train_scores_mean + train_scores_std, alpha=0.1, color="r"
    )
    plt.fill_between(
        train_sizes, test_scores_mean - test_scores_std, test_scores_mean + test_scores_std, alpha=0.1, color="g"
    )
    plt.plot(train_sizes, train_scores_mean, "o-", color="r", label="Training score")
    plt.plot(train_sizes, test_scores_mean, "o-", color="g", label="Cross-validation score")

    plt.legend(loc="best")
    return plt

def m_errorplot(x, Y, L, U):
    Y = np.atleast_2d(Y)
    L = np.atleast_2d(L)
    U = np.atleast_2d(U)
    M = Y.shape[-2]
    ## print(np.shape(Y))
    ## print(np.shape(L))
    ## print(np.shape(U))
    ## print(np.shape(M))
    for i in range(M):
        plt.subplot(M,1,i+1)
        lower = Y[i] - L[i]
        upper = Y[i] + U[i]
        #print(upper-lower)
        #if np.any(lower>=upper):
            #print('WTF?!')
        plt.fill_between(x,
                         upper,
                         lower,
                         #where=(upper>=lower),
                         facecolor=(0.6,0.6,0.6,1),
                         edgecolor=(0,0,0,0),
                         #edgecolor=(0.6,0.6,0.6,1),
                         linewidth=0,
                         interpolate=True)
        plt.plot(x, Y[i], color=(0,0,0,1))
        plt.ylabel(str(i))

    def plot(self):

        """
        Plot input current, recorded voltage, voltage after AEC (is applicable) and detected spike times (if applicable)
        """

        time = self.getTime()

        plt.figure(figsize=(10,4), facecolor='white')

        plt.subplot(2,1,1)
        plt.plot(time,self.I, 'gray')
        plt.ylabel('I (nA)')

        plt.subplot(2,1,2)
        plt.plot(time,self.V_rec, 'black')

        if self.AEC_flag :
            plt.plot(time,self.V, 'red')

        if self.spks_flag :
            plt.plot(self.getSpikeTimes(),np.zeros(len(self.spks)), '.', color='blue')

        # Plot ROI (region selected for performing operations)
        ROI_vector = 100.0*np.ones(len(self.V))
        ROI_vector[self.getROI() ] = -100.0
        plt.fill_between(self.getTime(), ROI_vector, -100.0, color='0.2')


        plt.ylim([min(self.V)-5.0, max(self.V)+5.0])
        plt.ylabel('V rec (mV)')
        plt.xlabel('Time (ms)')
        plt.show()

def __spatialaverages__(cr,path,selector=lambda x:x.yhead,
                        ylabel='y (cm)',xlim=None,ylim=None):
    if not os.path.exists(path):
        os.makedirs(path)
    
    cut = getballistictrials(cr)
    sessions = cut[cut.trial > 0].groupby(level=['subject','session'])
    for (subject,session),group in sessions:
        fig = plt.figure()
        subjectpath = os.path.join(activitymovies.datafolder,subject)
        sact = activitytables.read_subjects(subjectpath,days=[session])
        
        x,y,yerr = activitytables.spatialaverage(sact,group,selector)
        activityplots.trajectoryplot(sact,group,alpha=0.2,flip=True,
                                     selector=selector)
        plt.fill_between(x,y-yerr,y+yerr)
        
        if xlim is not None:
            plt.xlim(xlim)
        if ylim is not None:
            plt.ylim(ylim)
        plt.xlabel('x (cm)')
        plt.ylabel(ylabel)
        plt.title(str.format('{0} (session {1})',subject,session))
        fname = str.format("{0}_session_{1}_trajectories.png",
                           subject, session)
        fpath = os.path.join(path,subject)
        if not os.path.exists(fpath):
            os.makedirs(fpath)
        fpath = os.path.join(fpath,fname)
        plt.savefig(fpath)
        plt.close(fig)