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How to make a contour plot in Python?

 
Greenhorn
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Dear I am a beginner in python, Could someone help me how to make a contour using python. For example i have 4 days data below :

height temp  height  temp  height  temp  height  temp
9.3    28.0   8.7     27.6  10.0    26.0   9.5    26.8
9.7    27.3   9.3     26.8  12.8    25.5   10.8   25.9
10.0   26.8   10.8    25.9  13.1    25.3   11.4   25.0
10.6   26.5   12.7    24.4  14.8    24.7   12.9   24.2
12.8   26.0   13.5    23.8  15.2    24.3   13.6   23.4
13.3   25.7   17.8    22.7  16.8    23.7   14.0   22.6
16.8   25.4   18.9    22.4  17.9    23.3   14.7   22.0
17.2   24.6   20.0    21.0  18.6    23.0   15.9   21.3

How to make a contour, if i would like makes x axis=day number, y axis=height and z=temp data. Thank you very much
 
Ranch Hand
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When you said that you wanted to make a contour, did you mean a contour plot or graph?  If so, perhaps this can be solved using the pandas and matplotlib libraries.  When I did search using those two library names, I found numerous sites that will teach someone how to use those libraries to load data and create graphs from it.

HTH,
Travis
 
Dodi Ardiansyah
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Dear travis,
I mean i want to make a contour plot using python, Could you give me some suggestion how to make it?
 
Travis Risner
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Hi Dodi,

Did you try searching on "python pandas matplotlib" yet?  Are you using modern python (version 3) or jython/legacypython?  The link for pandas documentation for modern python starts at https://pandas.pydata.org/pandas-docs/stable/.  I took a closer look at matplotlib and discovered that it is only good for 2D graphs.  This link https://stackoverflow.com/questions/36589521/how-to-surface-plot-3d-plot-from-dataframe shows a hint about how to create a 3D graph.

If you are forced to use Jython/legacy Python. we will have to look further for a solution or find a way to graft a modern python solution back into your current framework.

HTH,
Travis
 
Dodi Ardiansyah
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Hi Travis,

I have been searching on the web there is so many example, but i am still confused because i am a beginner. I have tried my script below :

import pandas as pd
import matplotlib.pyplot as plt
import numpy as np
import matplotlib.colors as colors
import csv
import glob
import os


path = "C:/Users/SYIFAAZRA/Documents/belajar_wradlib/Skew-T/New/"
os.chdir(path)

filenames = glob.glob("*.csv")

dfs = []
for f in filenames:
   col_names = ['height', 'temp']
   df = pd.read_csv(f, delimiter=',',skiprows=7, usecols=[11, 21], names=col_names, na_values=['----'])
   df = df.dropna()

   max = df.height.idxmax()
   min = df.height.idxmin()
   df = df.loc[min:max, :]

   dfs.append(df)

df2 = pd.concat(dfs, ignore_index=False, axis=1)

fig = plt.figure()
ax = fig.add_subplot(111)

x = np.linspace(0,100, 50)
y = df['height']
X,Y = np.meshgrid(x, y)
Z = df['temp']
plt.show()

A contour has not showed. I don't know in where part i have wrong because nothing error warning from my script above. Perhaps you can help me travis.

 
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