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# Computer systems 4 GOLEM  (basic examples)

## $U_l$ @ #33993

### Python (e.g. through [the Jupyter Notebook](jupyter.org))

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~~~
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt


shot_no = 33993

data_URL = "http://golem.fjfi.cvut.cz/shots/{shot_no}/DASs/StandardDAS/{identifier}.csv"  
ds = np.DataSource(destpath='/tmp')

def open_remote(shot_no, identifier, url_template):
    return ds.open(url_template.format(shot_no=shot_no, identifier=identifier))

def read_signal(shot_no, identifier): 
    file = open_remote(shot_no, identifier, data_URL)
    return pd.read_csv(file, names=['Time',identifier],
                     index_col='Time', squeeze=True)  # squeeze makes simple 1-column signals a Series

loop_voltage = read_signal(shot_no, 'LoopVoltageCoil_raw')
ax = loop_voltage.plot(grid=True)
ax.set(xlabel="Time [s]", ylabel="$U_l$ [V]", title="Loop voltage $U_l$ #{}".format(shot_no));

plt.savefig('graph.jpg')


#Run it: save it as script.py and run "python script.py" or execute in a ceel in a Jupyter Notebook
~~~

</td><td><img src="CompAlgSystems4GolemFromShotNo32300/python/Demos/33993/Ul/code/graph.jpg"></img></td></tr>
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