How to invert scatter plot axis
 How to invert scatter plot axis Mark17 Splitter Posts: 157 Threads: 66 Joined: Aug 2019 Reputation: Sep-20-2021, 06:13 PM Hi all, Here's some code: ```import pandas as pd import matplotlib.pyplot as plt import time import numpy as np start_time = time.time() df = pd.DataFrame(columns=['DTE', 'Long Delta', 'Short Delta', 'Delta Spread']) # Checking all permutations covered by program: for dte in range(30,61): long_delta = np.arange(-0.1,-0.35,-0.05) short_delta = np.arange(-0.25,-0.50,-0.05) if dte == 30: for ld in long_delta: for sd in short_delta: plt.scatter(ld,sd) plt.tight_layout() #to prevent axis labels from being cut off in saved figure plt.xlabel('Long Delta') plt.ylabel('Short Delta') end_time = time.time() print('Elapsed time is {:.0f}ms'.format(1000*(end_time-start_time)))```How do I reverse the axes on the graph so they go from largest to smallest (left to right and down to up)? Mark Reply jefsummers Da Bishop Posts: 1,155 Threads: 1 Joined: May 2019 Reputation: Sep-20-2021, 06:52 PM ```import matplotlib.pyplot as plt ex = [0,0.2,0.5,1] ey = [0.1, 1,2.5,4] #plot normal plaid = plt.scatter(ex, ey) #now reverse axes fig, ax = plt.subplots() ax.scatter(ex, ey) ax.set_xlim(1,0) ax.set_ylim(5,-1) ax.grid = True plt```You might use plt.show() - I was in a notebook so just used plt Mark17 likes this post Reply Mark17 Splitter Posts: 157 Threads: 66 Joined: Aug 2019 Reputation: Sep-22-2021, 11:29 AM (Sep-20-2021, 06:52 PM)jefsummers Wrote: ```import matplotlib.pyplot as plt ex = [0,0.2,0.5,1] ey = [0.1, 1,2.5,4] #plot normal plaid = plt.scatter(ex, ey) #now reverse axes fig, ax = plt.subplots() ax.scatter(ex, ey) ax.set_xlim(1,0) ax.set_ylim(5,-1) ax.grid = True plt```You might use plt.show() - I was in a notebook so just used plt So I have to use the object-oriented approach with fig and ax to invert axes? Also, when I initially did this I didn't know what the min and max were going to be: matpltlib calculated that on its own. Do I have to run once to see what the min and max are and then take those values to build into the code? Thanks jefsummers! Mark Reply jefsummers Da Bishop Posts: 1,155 Threads: 1 Joined: May 2019 Reputation: Sep-22-2021, 04:45 PM I believe that is the way to get access to the axes. Change lines 11 and 12 to ```ax.set_xlim(max(ex), min(ex)) ax.set_ylim(max(ey),min(ey))``` Mark17 likes this post Reply

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