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+--- Thread: strange behaviour- plotting (/thread-31682.html)
strange behaviour- plotting - nathan_Blanc_Haifa - Dec-27-2020
I am trying to plot to vectors against one another. when I don't touch the ticks, I get ticks with 16 digits that overlap. when I try to change the tick format the values of the ticks themselves change, and display the index instead of the vector value. I wanted to upload the files and screenshots but couldn't do it. my code is:
import csv
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.ticker as ticker
plt.rcParams.update(plt.rcParamsDefault)
#import data
with open('hw3_ex1.csv', newline='') as csvfile:
data = list(csv.reader(csvfile))
data=np.array(data)
N=data.shape[0]
data=data[1:N-1,:]
m=data.shape[0] #number of points
dp=data[:,0] #pressure difference
Q=data[:,1] # flow rate
plt.plot(dp.tolist(),Q.tolist())
#plt.scatter(dp,Q)
axes= plt.axes()
axes.xaxis.set_major_locator(plt.MaxNLocator(5))
axes.yaxis.set_major_locator(plt.MaxNLocator(5))
#these lines should be uncommented to see the second screenshot
#axes.yaxis.set_major_formatter(ticker.StrMethodFormatter("{x:.1f}"))
#axes.xaxis.set_major_formatter(ticker.StrMethodFormatter("{x:.1f}"))
#axes.set_xticks(5)
#axes.set_yticks(5)
plt.show()