def gen_bars(data, headers, datasets, methods):
"""
Description:
Inputs:
Outputs:
"""
width = 0.5
x = np.arange(0, 16, 2)
labels_x = datasets.copy()
labels_x.insert(0,"")
fig, ax = plt.subplots()
bar1 = ax.bar(x - (0.3 + width/2), data[0,:], width, label = methods[0])
add_labels(ax, bar1)
if (len(methods) > 1):
bar2 = ax.bar(x , data[1,:], width, label = methods[1])
add_labels(ax, bar2)
if (len(methods) > 2):
bar3 = ax.bar(x + (0.3 + width/2), data[1,:], width, label = methods[2])
add_labels(ax, bar3)
ax.set_ylabel(metric)
ax.set_xlabel("Dataset")
ax.set_xticklabels(labels_x)
ax.set_title(metric + " Across Datasets")
ax.legend(bbox_to_anchor=(1, 1.15), fancybox=True, framealpha=0.5)
def plotmeshval(val,ixmin=None,ixmax=None,iymin=None,iymax=None,
r_min=None,r_max=None,z_min=None,z_max=None,title=None,units=None,
block=True):
"""
plotmeshval(val,ixmin=<int>,ixmax=<int>,iymin=<int>,iymax=<int>
title=<string>,units=<string>,block=<True|False>)
Display 2-D quantity using polyfill.
where ixmin, ixmax, iymin, and iymax are integer variables or
expressions used to plot a portion of the grid. title is used as
both the title and the figure name. Units are displayed in the
side colorbar. Block default is True.
The plot axis limits may be specified with r_rmin,r_max,z_min,z_max.
"""
if ixmin == None: ixmin = com.nxomit
if ixmax == None: ixmax = (com.nxm-1)
if iymin == None: iymin = 0
if iymax == None: iymax = (com.ny-1)
if r_min == None: r_min = com.rm.min()
if r_max == None: r_max = com.rm.max()
if z_min == None: z_min = com.zm.min()
if z_max == None: z_max = com.zm.max()
rcdefaults()
if title == None:
title='Uedge'
fig, ax = plt.subplots()
verts = np.array([])
z = np.array([])
for ix in range(ixmax-ixmin+1):
for iy in range(iymax-iymin+1):
v = []
v.append([com.rm[ix,iy,1],com.zm[ix,iy,1]])
v.append([com.rm[ix,iy,2],com.zm[ix,iy,2]])
v.append([com.rm[ix,iy,4],com.zm[ix,iy,4]])
v.append([com.rm[ix,iy,3],com.zm[ix,iy,3]])
verts = np.append(verts,v)
z = np.append(z,val[ix,iy])
verts = verts.reshape(len(z),4,2)
ax.set_title(title)
ax.set_ylabel('Z (m)')
ax.set_xlabel('R (m)')
ax.set_aspect('equal')
coll = PolyCollection(verts,array=z,cmap=cm.jet,edgecolors='face')
ax.add_collection(coll)
ax.autoscale_view()
cbar = fig.colorbar(coll,ax=ax)
#if units != None: cbar.ax.set_ylabel(units,rotation=-90,va='bottom')
if units != None: cbar.ax.set_ylabel(units,va='bottom')
plt.ylim(z_min,z_max)
plt.xlim(r_min,r_max)
#plt.show(block=block)
plt.ion()
plt.show()
plt.pause(0.001)
def club_tags(unencoded_clubs_list):
"""
Creates a bar graph showing of the number of occurrances of each possible club tag.
By using a dictionary to count club tag occurrances, the function then creates a
matplotlib bar graph using numpy representations of the dictionary information.
The graph is formatted and pushed as a Response type for view on the server.
Returns:
--------
Response
The graph
"""
club_dict = {}
for clubs in unencoded_clubs_list:
for tag in clubs.get_category():
if tag in club_dict:
club_dict[tag] = club_dict[tag] + 1
else:
club_dict[tag] = 1
x = np.zeros(len(club_dict))
index_counter = 0
for tag in club_dict:
x[index_counter] = club_dict.get(tag)
index_counter = index_counter + 1
fig = plt.figure()
ax = fig.add_subplot()
bar = ax.bar(np.arange(len(club_dict)), x)
labels = club_dict.keys()
ax.set_xticks(np.arange(len(club_dict)))
ax.set_xticklabels(labels, rotation='45', ha='right')
ax.set_xlabel('Club Tags')
ax.set_ylabel('Number of Occurrances')
ax.set_title('Number of Club Tag Occurrances')
for rect in bar:
height = rect.get_height()
ax.annotate('{}'.format(height),
xy=(rect.get_x() + rect.get_width() / 2, height),
xytext=(0, 3),
textcoords="offset points",
ha='center',
va='bottom')
plt.tight_layout()
output = io.BytesIO()
FigureCanvas(fig).print_png(output)
return Response(output.getvalue(), mimetype='image/png')
def clubs_per_user(user_list):
"""
Creates a bar graph of the number of clubs per user.
Using a dictionary to gather each user's name and the number of club each
user is in, numpy representations of the data is used to create a matplotlib
bar graph. The graph is then formatted and pushed for view on the server.
Returns:
--------
Response
The graph
"""
user_club_dict = {}
for user in user_list:
name = user.get_user_name()
user_club_dict[name] = len(user.get_user_clubs())
x = np.zeros(len(user_club_dict))
index_counter = 0
for user in user_club_dict:
x[index_counter] = user_club_dict.get(user)
index_counter = index_counter + 1
fig = plt.figure()
ax = fig.add_subplot()
bar = ax.bar(np.arange(len(user_club_dict)), x)
labels = user_club_dict.keys()
ax.set_xticks(np.arange(len(user_club_dict)))
ax.set_xticklabels(labels, rotation='45', ha='right')
ax.set_xlabel('User Name')
ax.set_ylabel('Number of Clubs')
ax.set_title('Number of Clubs per User')
for rect in bar:
height = rect.get_height()
ax.annotate('{}'.format(height),
xy=(rect.get_x() + rect.get_width() / 2, height),
xytext=(0, 3),
textcoords="offset points",
ha='center',
va='bottom')
plt.tight_layout()
output = io.BytesIO()
FigureCanvas(fig).print_png(output)
return Response(output.getvalue(), mimetype='image/png')
def plot_graph(train_history, label_col, mode):
# Obtain scores from history
loss = train_history.history['loss'] #List
val_loss = train_history.history['val_loss']
#Check if binary or multiclass problem to obtain correct metrics
if mode == 0:
acc = train_history.history['binary_accuracy']
val_acc = train_history.history['val_binary_accuracy']
else:
acc = train_history.history['categorical_accuracy']
val_acc = train_history.history['val_categorical_accuracy']
# Plot loss scores
sns.set_style("whitegrid")
fig, ax = plt.subplots(1, 1)
ax.plot(loss, label = "Loss")
ax.plot(val_loss, label = "Validation Loss")
ax.set_title('Model Loss')
ax.legend(loc = "upper right")
ax.set_xlim([0, 100])
ax.set_ylabel("Loss")
ax.set_xlabel("Epochs")
ax.minorticks_on()
ax.grid(b=True, which='major')
ax.grid(b=True, which='minor')
plt.savefig(results_dir + '/' + label_col + '_loss.png')
plt.show()
# Plot accuracy scores
fig, ax = plt.subplots(1, 1)
ax.plot(acc, label = "Accuracy")
ax.plot(val_acc, label = "Validation Accuracy")
ax.set_title('Model Accuracy')
ax.legend(loc = "lower right")
ax.set_xlim([0, 100])
ax.grid(b=True, which='major')
ax.grid(b=True, which='minor')
ax.set_ylabel("Accuracy")
ax.set_xlabel("Epochs")
ax.minorticks_on()
plt.savefig(results_dir + '/' + label_col + '_acc.png')
plt.show()
return 0
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.axes as ax
import pylab
# change to proper directory
os.chdir('C:\Users\Matt\Desktop\Python Projects\Exploratory Data Analysis')
# load file, select proper date range, convert row to numeric dtypes
hpc = pd.read_csv('household_power_consumption.txt',
sep=';',
index_col=['Date'],
usecols=['Global_active_power', 'Date'])
# hpc = hpc.drop(['Date', 'Time'], axis=1).set_index('DT')
hpc = hpc['1/2/2007':'3/2/2007'].convert_objects(convert_numeric=True)
hpc = hpc[0:2881]
# create plotting variables
x = pd.date_range('2/1/2007', '2/3/2007 00:00', freq='T')
y = hpc['Global_active_power']
#plt.plot(y, color='k')
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
ax.plot(x, y, color='k')
ax.set_xticklabels(['Thur', '', '', '', 'Fri', '', '', '', 'Sat'])
ax.set_yticklabels(['0', '', '2', '', '4', '', '6'])
#plt.xlabel('Global Active Power (kilowatts)')
ax.set_ylabel('Global Active Power (kilowatts)')
#plt.title('Global Active Power')
pylab.show()
from matplotlib import rcParams
from matplotlib import axes as ax
from mpl_toolkits.mplot3d import Axes3D
import numpy as np
x, y, z, vx, vy, vz = np.loadtxt('./coordAa.dat.txt', unpack=True)
print(len(x))
fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
ax.scatter(x, y, z, c='r', marker='.', s=0.1)
#Axes3D.scatter(x,y,z)
ax.set_xlabel('X [kpc]')
ax.set_ylabel('Y [kpc]')
ax.set_zlabel('Z [kpc]')
#plt.axis([-1500., 1500., -1500., 1500, -1500, 1500])
ax.set_xlim3d(-1500, 1500)
ax.set_ylim3d(-1500, 1500)
ax.set_zlim3d(-1500, 1500)
plt.show()
radius = sorted([
np.sqrt(i**2 + j**2 + k**2) for i, j, k in zip(x, y, z)
if np.sqrt(i**2 + j**2 + k**2) <= 300
])
max_radius = max(radius)
min_radius = min(radius)
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.axes as ax
import pylab
# change to proper directory
os.chdir('C:\Users\Matt\Desktop\Python Projects\Exploratory Data Analysis')
# load file, select proper date range, convert row to numeric dtypes
hpc = pd.read_csv('household_power_consumption.txt',
sep=';',
index_col=['Date'],
usecols=['Global_active_power', 'Date'])
hpc = hpc['1/2/2007':'2/2/2007'].convert_objects(convert_numeric=True)
# create plotting variables
y = pd.value_counts(hpc.Global_active_power,
bins=np.arange(0, 8, 0.5),
sort=False)
index = y.index
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
ax.bar(index, y, width=0.5, color='r')
ax.set_xlabel('Global Active Power (kilowatts)')
ax.set_ylabel('Frequency')
ax.set_title('Global Active Power')
pylab.show()
# hpc[hpc['Global_active_power'] > 4]
import matplotlib.pyplot as plt
import matplotlib.axes as ax
import pylab
# change to proper directory
os.chdir('C:\Users\Matt\Desktop\Python Projects\Exploratory Data Analysis')
# load file, select proper date range, convert row to numeric dtypes
hpc = pd.read_csv('household_power_consumption.txt', sep=';', index_col=['Date'], usecols=['Sub_metering_1', 'Sub_metering_2', 'Sub_metering_3', 'Date'])
# hpc = hpc.drop(['Date', 'Time'], axis=1).set_index('DT')
hpc = hpc['1/2/2007':'3/2/2007'].convert_objects(convert_numeric=True)
hpc = hpc[0:2881]
# create plotting variables
x = pd.date_range('2/1/2007', '2/3/2007 00:00', freq='T')
y1 = hpc.Sub_metering_1
y2 = hpc.Sub_metering_2
y3 = hpc.Sub_metering_3
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
ax.plot(x, y1, color='k', label='Sub_metering_1')
ax.plot(x, y2, color='r', label='Sub_metering_2')
ax.plot(x, y3, color='b', label='Sub_metering_3')
ax.legend(loc='best')
ax.set_xticklabels(['Thur', '', '', '', 'Fri', '', '', '','Sat'])
ax.set_yticklabels(['0', '', '10', '', '20', '', '30'])
#plt.xlabel('Global Active Power (kilowatts)')
ax.set_ylabel('Energy sub metering')
#plt.title('Global Active Power')
pylab.show()
imgh = np.reshape(img, nx*ny)
imgh1 = np.reshape(img_mask1, nx1*ny1)
df=36*38
dof=chi2_distance(imgh,imgh1)
chi2_distance(imgh, imght[0,:])
chi2_distance(imgh, imght[1,:])
chi2_distance(imgh, imght[2,:])
chi2_distance(imgh, imght[3,:])
chi2_distance(imgh, imght[4,:])
chi2_distance(imgh, imght[5,:])
chi2_distance(imgh, imght[6,:])
chi_sfh=np.array([502.5312995308081,580.45729191839803,204.19667370317001,518.27719309677684,1534.8645907539676,1555.9265125639893])
weights = np.ones_like(chi_sfh)/float(len(chi_sfh))
fig, ax = plt.subplots(1, 1)
mean, var, skew, kurt = chi2.stats(df, moments='mvsk')
x = np.linspace(chi2.ppf(0.01, df), chi2.ppf(0.99, df), 100)
xu = np.linspace(chi2.ppf(0.01, dof), chi2.ppf(0.99, dof), 100)
ax.axvline(x=dof/df,color='k', linestyle='dashed',lw=4, label='UGC11680NED01 $\chi^2$')
ax.hist(chi_sfh/df,bins=10, normed=False,weights=weights, histtype='step', lw=3,label='Mass $10<\log (M/M_{\odot})<11$ , color $2<g-r<3$')
ax.legend(loc='best', frameon=False)
ax.set_ylabel('Probability density $\chi ^2$')
ax.set_xlabel('$x$')
plt.show()
t=25 #days
def f(x, y):
return np.sin(np.sqrt(x ** 2 + y ** 2))
x = np.linspace(-7, 7, 30)
y = np.linspace(-5, 5, 30)
X, Y = np.meshgrid(x, y)
Z = f(X, Y)
fig = plt.figure()
ax = plt.axes(projection='3d')
ax.contour3D(X, Y, Z, 50, cmap='binary')
ax.set_xlabel('x')
ax.set_ylabel('y')
ax.set_zlabel('z');
# ## Models of bumblebee population growth over many seasons
#
# ### Infinite resources (exponential growth)
# Assuming infinite resources in the environment (probably never the case in nature for bees) and nothing systematically killing populations, bumblebee populations will increase at $\frac{dx}{dt}= kx$, which solves to $x(t)= Ce^{kt}$. k is just some growth constant.
#
# ### Finite resources (logistic growth)
# With finite resources, bee populations will grow according to $\frac {dx}{dt}=kx(1-\frac{x}{C})$, where k is a growth constant and C is the carrying capacity of the environment. An analytic solution is $x=\frac{C}{1+Ae^{-kt}}$ where $A=\frac{C-X_{0}}{X_{0}}$.
#
# ### Finite resources + big bad pesticides.
# Now let's introduce neonicotinoid into the equation once the bees have reached carrying capacity. These pesticides both kill bees directly and decrease their reproductive capacity, so here I'll have a lower k as well as some constant d representing a proportion of bee deaths.
# This scenario is represented by the differential equation $\frac{dx}{dt}= (k-d)x$, which solves to $x(t)= Ce^{(k-d)t}$
def create_bar_graph(data=[[[1, 2], [10, 20]]],
semilog=False,
add_bar_labels=True,
title='Insert Fancy Title',
add_legend=False,
bar_colors=[],
legend_labels=[]):
import matplotlib.patches as mpatches
from collections import deque
if not bar_colors:
bar_color_deque = deque([
'#1395ba', '#a2b86c', '#ebc844', '#f16c20', '#c02e1d', '#0d3c55',
'#ecaa38', '#117899', '#d94e1f', '#5ca793', '#ef8b2c', '#0f5b78'
])
else:
bar_color_deque = deque(bar_colors)
width = 0.33
xs = data[0][0]
legend_labels_queue = deque(legend_labels)
handles = []
if len(data) > 1:
width = 0.33 * 2 / len(data)
#plot comparison from multiple archives
all_unique_x = {}
for series in data:
for size in series[0]:
all_unique_x[size] = True
ind = np.arange(len(all_unique_x.keys()))
rect_refs = []
fig, ax = plt.subplots()
bar_shift = width / 2
#plot individual bars to allow for sparse data plots
for series in data:
if len(series) > 2:
label = series[2]
color = bar_color_deque.popleft()
if legend_labels:
legend_label = legend_labels_queue.popleft()
else:
legend_label = label
handles.append(mpatches.Patch(color=color, label=legend_label))
index = 0
labeled_yet = False
for ex in sorted(all_unique_x.keys()):
for i in range(0, len(series[0])):
if series[0][i] == ex:
if 'label' in locals() and not labeled_yet:
rects = ax.bar(index + bar_shift,
series[1][i],
width,
color=color,
label=label)
labeled_yet = True
else:
rects = ax.bar(index + bar_shift,
series[1][i],
width,
color=color)
rect_refs.append(rects[0])
if add_bar_labels:
bar_label(ax, rects, semilog)
index += 1
bar_shift += width
if semilog:
ax.set_yscale('log')
ax.set_xticks(ind + 0.59 - 0.045 * len(data))
if add_legend:
plt.legend(handles=handles, loc=2)
else:
color = bar_color_deque.popleft()
ys = data[0][1]
ind = np.arange(len(xs))
fig, ax = plt.subplots()
rects = ax.bar(ind + width, ys, color=color)
ax.set_xticks(ind + width * 2)
if semilog:
ax.set_yscale('log')
if add_bar_labels:
bar_label(ax, rects, semilog)
fig.set_size_inches(15, 8)
ax.set_xticklabels(xs, rotation=0)
ax.set_title(title)
ax.set_xlabel("Object Size (Bytes)")
ax.set_ylabel('MB/s')
plt.show()
plt.savefig('foo.png')
return
# import needed libraries
import os
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.axes as ax
import pylab
# change to proper directory
os.chdir('C:\Users\Matt\Desktop\Python Projects\Exploratory Data Analysis')
# load file, select proper date range, convert row to numeric dtypes
hpc = pd.read_csv('household_power_consumption.txt', sep=';', index_col=['Date'], usecols=['Global_active_power', 'Date'])
# hpc = hpc.drop(['Date', 'Time'], axis=1).set_index('DT')
hpc = hpc['1/2/2007':'3/2/2007'].convert_objects(convert_numeric=True)
hpc = hpc[0:2881]
# create plotting variables
x = pd.date_range('2/1/2007', '2/3/2007 00:00', freq='T')
y = hpc['Global_active_power']
#plt.plot(y, color='k')
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
ax.plot(x, y, color='k')
ax.set_xticklabels(['Thur', '', '', '', 'Fri', '', '', '','Sat'])
ax.set_yticklabels(['0', '', '2', '', '4', '', '6'])
#plt.xlabel('Global Active Power (kilowatts)')
ax.set_ylabel('Global Active Power (kilowatts)')
#plt.title('Global Active Power')
pylab.show()
# change to proper directory
os.chdir('C:\Users\Matt\Desktop\Python Projects\Exploratory Data Analysis')
# load file, select proper date range, convert row to numeric dtypes
hpc = pd.read_csv(
'household_power_consumption.txt',
sep=';',
index_col=['Date'],
usecols=['Sub_metering_1', 'Sub_metering_2', 'Sub_metering_3', 'Date'])
# hpc = hpc.drop(['Date', 'Time'], axis=1).set_index('DT')
hpc = hpc['1/2/2007':'3/2/2007'].convert_objects(convert_numeric=True)
hpc = hpc[0:2881]
# create plotting variables
x = pd.date_range('2/1/2007', '2/3/2007 00:00', freq='T')
y1 = hpc.Sub_metering_1
y2 = hpc.Sub_metering_2
y3 = hpc.Sub_metering_3
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
ax.plot(x, y1, color='k', label='Sub_metering_1')
ax.plot(x, y2, color='r', label='Sub_metering_2')
ax.plot(x, y3, color='b', label='Sub_metering_3')
ax.legend(loc='best')
ax.set_xticklabels(['Thur', '', '', '', 'Fri', '', '', '', 'Sat'])
ax.set_yticklabels(['0', '', '10', '', '20', '', '30'])
#plt.xlabel('Global Active Power (kilowatts)')
ax.set_ylabel('Energy sub metering')
#plt.title('Global Active Power')
pylab.show()
total += x * y
new[i][j] = total
return new
elif self.m == other.n:
return other * self
else:
raise ValueError(
"Cannot multiply two matrices of incompatable dimensions")
if __name__ == "__main__":
fig = plt.figure()
ax = fig.gca(projection="3d")
v3 = AVector("sin(x)", "cos(y)", "tan(z)")
v3.quiver(ax)
a, b, c = v3.evaluate(1, 1, 1)
print(a, b, c)
ax.set_xlabel("sin(x)")
ax.set_ylabel("cos(y)")
ax.set_zlabel("tan(z)")
plt.show()
theta = np.linspace(-4 * np.pi, 4 * np.pi, 100)
z = np.linspace(-2, 2, 100)
r = z**2 + 1
x = r * np.sin(theta)
y = r * np.cos(theta)
ax.plot(r_ECI[:, 0] / 1000,
r_ECI[:, 1] / 1000,
r_ECI[:, 2] / 1000,
label='Orbital Position',
color='k')
# Sphere to represent Earth
# Make data
u = np.linspace(0, 2 * np.pi, 100)
v = np.linspace(0, np.pi, 100)
x1 = rEarth / 1000 * np.outer(np.cos(u), np.sin(v))
y1 = rEarth / 1000 * np.outer(np.sin(u), np.sin(v))
z1 = rEarth / 1000 * np.outer(np.ones(np.size(u)), np.cos(v))
# Plot the surface
ax.plot_surface(x1, y1, z1, cmap='GnBu')
# Legend and labels
ax.legend()
ax.set_xlabel('X Pos (km)')
ax.set_ylabel('Y Pos (km)')
ax.set_zlabel('Z Pos (km)')
ax.set_aspect('equal')
plt.show()
if(float(cont[j].split(" ")[-1]) < 0.0):
a = 0
else:
a = float(cont[j].split(" ")[-1])
yAxis[i-start].append(a*10**(-7))
x = xAxis
#y = np.arange(50, 80.001, 0.75)
y = np.arange(50+(start)*0.75, 50+(end)*0.75, 0.75)
X, Y = np.meshgrid(x, y)
if(sys.argv[1] == "reducedElectricField"):
levels = [i for i in range(int(sys.argv[2]), int(sys.argv[3]), int(sys.argv[4]))]
elif(sys.argv[1] == "eDens"):
levels = [i/10.0 for i in range(int(sys.argv[2]), int(sys.argv[3]))]#EDENS
else:
levels = [-1, 0, 1]#CHEMISTRY
Z = yAxis
fig = plt.figure()
ax = fig.add_subplot(111)
ax.tick_params(labelsize=40)
ax.set_xticks([-4, -3, -2, -1, 0])
CS = ax.contourf(X, Y, Z, levels)
ax.set_ylabel("Altitude (km)", fontsize=40)
ax.set_xlabel(r"logarithmic Time ($\mathrm{s}$)", fontsize=40)
#ax.set_xlabel(r"Time ($\mathrm{ms}$)", fontsize=40)
cb = plt.colorbar(CS)
cb.ax.tick_params(labelsize=40)
#plt.savefig("{}.png".format(sys.argv[1]))
plt.show()
# import needed libraries
import os
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.axes as ax
import pylab
# change to proper directory
os.chdir('C:\Users\Matt\Desktop\Python Projects\Exploratory Data Analysis')
# load file, select proper date range, convert row to numeric dtypes
hpc = pd.read_csv('household_power_consumption.txt', sep=';', index_col=['Date'], usecols=['Global_active_power', 'Date'])
hpc = hpc['1/2/2007':'2/2/2007'].convert_objects(convert_numeric=True)
# create plotting variables
y = pd.value_counts(hpc.Global_active_power, bins=np.arange(0, 8, 0.5), sort=False)
index = y.index
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
ax.bar(index, y, width=0.5, color='r')
ax.set_xlabel('Global Active Power (kilowatts)')
ax.set_ylabel('Frequency')
ax.set_title('Global Active Power')
pylab.show()
# hpc[hpc['Global_active_power'] > 4]
