Display matplotlib graph in browser

Question

I am using matplotlib library of python for plotting graphs. My program is to detect the outliers in the system. I am making an interface for this. I have to show this graph in browser on clicking the button. Here is my php file code :-

<?php
    if (isset($_POST['button']))
    {
         echo shell_exec("python3 /var/www/html/python/anomalies.py 2>&1");
    }
?>
<html>

<body>
<center>


    <form method="post">
    <table>
        <tr>
            <td>
                Enter CSV file path:
            </td>
            <td>
                <input type="text" name="path">
            </td>
        </tr>
    </table>
    <p>
        <button name="button">Identify Anomalies</button>
    </p>
    </form>
    </center>
</body>

on clicking this button a python script runs which gives the output as graph. The problem is that if i run it by command line, the script generates the graph as output. but when i run this script through browser button click, it generates the following error:

Traceback (most recent call last): File "/var/www/html/python/anomalies.py", line 72, in plt.xlabel('RelativeTime (ms)') File "/usr/local/lib/python3.4/dist-packages/matplotlib/pyplot.py", line 1512, in xlabel return gca().set_xlabel(s, *args, **kwargs) File "/usr/local/lib/python3.4/dist-packages/matplotlib/pyplot.py", line 984, in gca return gcf().gca(**kwargs) File "/usr/local/lib/python3.4/dist-packages/matplotlib/pyplot.py", line 601, in gcf return figure() File "/usr/local/lib/python3.4/dist-packages/matplotlib/pyplot.py", line 548, in figure **kwargs) File "/usr/local/lib/python3.4/dist-packages/matplotlib/backend_bases.py", line 161, in new_figure_manager return cls.new_figure_manager_given_figure(num, fig) File "/usr/local/lib/python3.4/dist-packages/matplotlib/backends/_backend_tk.py", line 1044, in new_figure_manager_given_figure window = Tk.Tk(className="matplotlib") File "/usr/lib/python3.4/tkinter/__init__.py", line 1854, in __init__ self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use) _tkinter.TclError: no display name and no $DISPLAY environment variable

Here is my python code snippet:-

plt.xlabel('R_Time (ms)')
plt.ylabel('A_Time (ms)')
plt.title('R-A Combinations')
plt.plot(tr_data[:,0],tr_data[:,1],'bx')
plt.plot(tr_data[outliers,0],tr_data[outliers,1],'ro')

plt.show()

I tried using mpld3 but found no resolution. Please suggest where i am missing it in.

hitttt · Accepted Answer · 2018-04-10 05:17:38Z

19

After lot of R & D, i am able to solve it. Here is the updated code :-

import matplotlib
matplotlib.use('WebAgg')
import matplotlib.pyplot as plt,mpld3

fig1 = plt.figure()
plt.xlabel('RelativeTime (ms)')
plt.ylabel('AbsoluteTime (ms)')
plt.title('R-A Combinations')
plt.plot(tr_data[:,0],tr_data[:,1],'bx')    
plt.plot(tr_data[outliers,0],tr_data[outliers,1],'ro')    
print ('<HTML><HEAD><TITLE>Python Matplotlib Graph</TITLE></HEAD>')
print ('<BODY>')
print ('<CENTER>')
print ('<br><br>')
print ('<H3>Graph</H3>')
print (mpld3.fig_to_html(fig1, d3_url=None, mpld3_url=None, no_extras=False, template_type='general', figid=None, use_http=False))
print ('<br>')

print ('</CENTER>')
print ('</BODY>')
print ('</html>')

answered Apr 10, 2018 at 5:17

hitttt

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1 Comment

Ulysses Over a year ago

Cool this is of much help

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