Answer to - How do I combine and display active and reactive power data on the same graph?

Starting assumptions

The nilmtk is installed and working, along with all of its dependencies
IPython notebook is installed and working and you know how to use it
You have a dataset available that contains the data you want to display
You have imported the data into the toolkit by creating a HDF5 file containg the data and metadata

The steps to follow are listed below

Step-1 Imports and graph setup



In [1]:

    
from matplotlib import rcParams
import matplotlib.pyplot as plt
%matplotlib inline
rcParams['figure.figsize'] = (13, 6)
plt.style.use('ggplot')
from nilmtk import DataSet

Step-2 Import the data and extract the part you are interested in



In [2]:

    
gjw = DataSet('/Users/GJWood/nilm_gjw_data/HDF5/nilm_gjw_data.hdf5') #load the data from HDF5 file
gjw.set_window(start='2013-11-13 00:00:00', end='2013-11-14 00:00:00') #select a portion of the data
elec = gjw.buildings[1].elec #Select the relevant meter group

house = elec['fridge'] #only one meter so any selection will do



In [3]:

    
df = house.load().next() #load the first chunk of data into a dataframe
df.info() #check that the data is what we want (optional)
#note the data has two columns and a time index
#The period is one day, containing 86400 entries, one per second









    



<class 'pandas.core.frame.DataFrame'>
DatetimeIndex: 86400 entries, 2013-11-13 00:00:00+00:00 to 2013-11-13 23:59:59+00:00
Data columns (total 2 columns):
(power, reactive)    86400 non-null float32
(power, active)      86400 non-null float32
dtypes: float32(2)
memory usage: 1.3 MB

Step-3 Plot the data from the dataframe



In [4]:

    
df.plot()









    Out[4]:





<matplotlib.axes._subplots.AxesSubplot at 0x178b1208>

Step-4 Zoom in on a time period of interest (optional)



In [5]:

    
df.ix['2013-11-13 06:30:00':'2013-11-13 07:30:00'].plot()# select a time range and plot it









    Out[5]:





<matplotlib.axes._subplots.AxesSubplot at 0x17880a58>

Step-5 See what is attached to this meter (optional)



In [6]:

    
house









    Out[6]:





ElecMeter(instance=1, building=1, dataset='gjwdata', site_meter, appliances=[Appliance(type='washing machine', instance=1), Appliance(type='tumble dryer', instance=1), Appliance(type='freezer', instance=1), Appliance(type='boiler', instance=1), Appliance(type='light', instance=1), Appliance(type='light', instance=2), Appliance(type='clothes iron', instance=1), Appliance(type='food steamer', instance=1), Appliance(type='kettle', instance=1), Appliance(type='toaster', instance=1), Appliance(type='coffee maker', instance=1), Appliance(type='microwave', instance=1), Appliance(type='electric oven', instance=1), Appliance(type='fridge', instance=1), Appliance(type='dish washer', instance=1), Appliance(type='waste disposal unit', instance=1), Appliance(type='water filter', instance=1), Appliance(type='fan', instance=1), Appliance(type='light', instance=3), Appliance(type='mobile phone charger', instance=1), Appliance(type='television', instance=1), Appliance(type='server computer', instance=1), Appliance(type='wireless phone charger', instance=1), Appliance(type='light', instance=4), Appliance(type='light', instance=5), Appliance(type='light', instance=6), Appliance(type='vacuum cleaner', instance=1), Appliance(type='vacuum cleaner', instance=2), Appliance(type='television', instance=2), Appliance(type='blu-ray player', instance=1), Appliance(type='light', instance=7), Appliance(type='light', instance=8), Appliance(type='audio system', instance=1), Appliance(type='CD player', instance=1), Appliance(type='light', instance=9), Appliance(type='light', instance=10), Appliance(type='light', instance=11), Appliance(type='plate warmer', instance=1), Appliance(type='light', instance=12), Appliance(type='motor', instance=1), Appliance(type='light', instance=13), Appliance(type='electric space heater', instance=1), Appliance(type='light', instance=14), Appliance(type='light', instance=15), Appliance(type='water pump', instance=1), Appliance(type='CE appliance', instance=1), Appliance(type='light', instance=16), Appliance(type='radio', instance=1), Appliance(type='wireless phone charger', instance=2), Appliance(type='electric blanket', instance=1), Appliance(type='television', instance=3), Appliance(type='electric space heater', instance=2), Appliance(type='light', instance=17), Appliance(type='light', instance=18), Appliance(type='electric space heater', instance=3), Appliance(type='light', instance=19), Appliance(type='light', instance=20), Appliance(type='light', instance=21), Appliance(type='light', instance=22), Appliance(type='radio', instance=2), Appliance(type='computer', instance=1), Appliance(type='computer monitor', instance=2), Appliance(type='computer monitor', instance=1), Appliance(type='computer monitor', instance=3), Appliance(type='multi-function device', instance=1), Appliance(type='wireless phone charger', instance=3), Appliance(type='light', instance=23), Appliance(type='computer', instance=2), Appliance(type='computer', instance=3), Appliance(type='computer monitor', instance=4), Appliance(type='television', instance=4), Appliance(type='light', instance=24), Appliance(type='server computer', instance=2), Appliance(type='CE appliance', instance=2)], room=utility)



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