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<div name="messageBodySection" style="font-size: 14px; font-family: -apple-system, BlinkMacSystemFont, sans-serif;">Ah, I didn’t notice that you were doing pandas plotting instead of matplotlib. This is ok: pandas plot takes an ax= keyword that lets you specify an axis on which to plot. You can then ignore the secondary_y nonsense which is unnecessary if you use the matplotlib object-oriented API. The code below works for me. (Apologies for the primary y label, as I don’t know what your quantities represent. ;)
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<div>Note, the title and x label need to happen on the first axes you declare, which in this case is ax_bar. If I tried to add them to ax_line nothing happened.<br />
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<div>import matplotlib.pyplot as plt</div>
<div>import numpy as np</div>
<div>import pandas as pd</div>
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<div>width = 1 # width of a bar</div>
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<div>m1_t = pd.DataFrame({</div>
<div> 'SD-0' :[246,211,212,85.3,131,370,124.3,115.8,135.3,145.2,104.3,59,42.4,55.8,20.2,13.9,5.15],</div>
<div> 'SD-15' :[236,176,169,126,152,86.8,98,212,164,131,91,77.9,18.5,30.5,21.4,6.3,13.5],</div>
<div> '15':[715,1260,639,783,949,1032,1155,1343,1095,744,451,304,251,110,88.6,56.2,52.2],</div>
<div> '0' :[530,1173,762,669.5,867,1018,1221,1203,1148,632,501,338,265,195,135,111,107]})</div>
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<div>fig, ax_bar = plt.subplots()</div>
<div>ax_line = ax_bar.twinx()</div>
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<div>m1_t[['SD-0','SD-15']].plot(kind='bar', width = width, ax=ax_bar)</div>
<div>m1_t['0'].plot(label='0 ppt',marker='o', ax=ax_line)</div>
<div>m1_t['15'].plot(label='15 ppt',marker='o', ax=ax_line)</div>
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<div>ax_line.set_xlim(-width, m1_t.shape[0] + width)</div>
<div>ax_line.set_xticklabels(('0.25','0.5','1','2','4','6','8','12','24','48','96','144','192','288','336','432','528'))</div>
<div>ax_line.legend(loc='upper right', bbox_to_anchor=(1,0.85))</div>
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<div>ax_line.set_ylabel("Concentration")</div>
<div>ax_bar.set_title("Fish Study")</div>
<div>ax_bar.set_xlabel("time")</div>
<div>ax_bar.set_ylabel("whatever")</div>
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<div>plt.tight_layout()</div>
<div>plt.show()</div>
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<div name="messageReplySection" style="font-size: 14px; font-family: -apple-system, BlinkMacSystemFont, sans-serif;"><br />
On 29 Mar 2018, 6:46 PM -0400, Ravi Thakkar <ravi.thakkar369@gmail.com>, wrote:<br />
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<div class="gmail_default" style="font-family:garamond,serif;font-size:large">Hi Juan,</div>
<div class="gmail_default" style="font-family:garamond,serif;font-size:large">Thanks. I want to draw bar graph and its showing error. I dont have mathematically derived data on axis, I have straight forward observations. I want to compare concentration of two different drug on by bar graph and another with two line graph. All in same graph. If you can suggest any example. TIA.</div>
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<div class="gmail_quote">On Thu, Mar 29, 2018 at 12:20 PM, Juan Nunez-Iglesias <span dir="ltr"><<a href="mailto:jni.soma@gmail.com" target="_blank">jni.soma@gmail.com</a>></span> wrote:<br />
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<div name="messageBodySection" style="font-size:14px;font-family:-apple-system,BlinkMacSystemFont,sans-serif">Hi Ravi, and welcome!
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<div>I think this example does what you want?</div>
<div><a href="https://matplotlib.org/examples/api/two_scales.html" target="_blank">https://matplotlib.org/<wbr />examples/api/two_scales.html</a><br /></div>
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<div>Juan.</div>
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<div class="h5"><br />
On 29 Mar 2018, 1:11 PM -0400, Ravi Thakkar <<a href="mailto:ravi.thakkar369@gmail.com" target="_blank">ravi.thakkar369@gmail.com</a>>, wrote:<br /></div>
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<div style="font-family:garamond,serif;font-size:large">Hi,</div>
<div style="font-family:garamond,serif;font-size:large">Guys, I am new to programming field, learning python to represent my research data. </div>
<div style="font-family:garamond,serif;font-size:large">Anyone here please help me to get the x axis label and separate label on both y axis. (as indicated in attached image).</div>
<div style="font-family:garamond,serif;font-size:large">Code is attached.</div>
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<div style="font-family:garamond,serif;font-size:large">Ravi.</div>
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