[Matplotlib-users] Lien&bar combination graph.

[Juan Nunez-Iglesias]

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. ;)

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.

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

width = 1 # width of a bar

m1_t = pd.DataFrame({
    '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],
    '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],
    '15':[715,1260,639,783,949,1032,1155,1343,1095,744,451,304,251,110,88.6,56.2,52.2],
    '0' :[530,1173,762,669.5,867,1018,1221,1203,1148,632,501,338,265,195,135,111,107]})

fig, ax_bar = plt.subplots()
ax_line = ax_bar.twinx()

m1_t[['SD-0','SD-15']].plot(kind='bar', width = width, ax=ax_bar)
m1_t['0'].plot(label='0 ppt',marker='o', ax=ax_line)
m1_t['15'].plot(label='15 ppt',marker='o', ax=ax_line)

ax_line.set_xlim(-width, m1_t.shape[0] + width)
ax_line.set_xticklabels(('0.25','0.5','1','2','4','6','8','12','24','48','96','144','192','288','336','432','528'))
ax_line.legend(loc='upper right', bbox_to_anchor=(1,0.85))

ax_line.set_ylabel("Concentration")
ax_bar.set_title("Fish Study")
ax_bar.set_xlabel("time")
ax_bar.set_ylabel("whatever")

plt.tight_layout()
plt.show()


On 29 Mar 2018, 6:46 PM -0400, Ravi Thakkar <ravi.thakkar369 at gmail.com>, wrote:
> Hi Juan,
> 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.
>
>
> > On Thu, Mar 29, 2018 at 12:20 PM, Juan Nunez-Iglesias <jni.soma at gmail.com> wrote:
> > > Hi Ravi, and welcome!
> > >
> > > I think this example does what you want?
> > > https://matplotlib.org/examples/api/two_scales.html
> > >
> > > Juan.
> > >
> > > On 29 Mar 2018, 1:11 PM -0400, Ravi Thakkar <ravi.thakkar369 at gmail.com>, wrote:
> > > > Hi,
> > > > Guys, I am new to programming field, learning python to represent my research data.
> > > > Anyone here please help me to get the x axis label and separate label on both y axis. (as indicated in attached image).
> > > > Code is attached.
> > > >
> > > > --
> > > > Ravi.
> > > > _______________________________________________
> > > > Matplotlib-users mailing list
> > > > Matplotlib-users at python.org
> > > > https://mail.python.org/mailman/listinfo/matplotlib-users
>
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