Plot graph in Python-CodePudding

import numpy as np

import pandas as pd

import matplotlib.pyplot as plt

'''

K = 1

Rmv = 26

SigS = 111.7

M = 2.050

N = 2

SigD = (-249.4)

def Mittelspannung():

result = [] 

Z = []

SigM = []

for i in range(1,31):
    output = 1 - pow((((i-1)*1/14.5)-1),2)
    result.append(output)
    #print(output)   

for value in range(0,15):
    C4 = (Rmv) - (result[value]) * (Rmv)
    Z.append(C4)
    print(C4)    

for value in range(15,30):                
    B11 = (SigD) - (result[value]) * (SigD)
    Z.append(B11)
    print(B11) 
      
for x in range(0,30):    
    SigMean = ((SigS**M * (1-(Z[x]   SigS)**N/(Rmv   SigS)**N))**(1/M)) / K
    SigM.append(SigMean) 
return SigM

print(Mittelspannung())

'''

I'm trying to plot the graph between 'Z' and 'SigM'. I'm getting an error. Could anyone please help in plotting the graph.

CodePudding user response：

You should create a list Z in which you are going to append the Z values computed at each iteration, like this:

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

K = 1
Rmv = 26
SigS = 111.7
M = 2.050
N = 2
SigD = (-249.4)

def Mittelspannung():
    result = [] 
    Y = []
    SigM = []
    Z = []

    for i in range(1,31):
        output = 1 - pow((((i-1)*1/14.5)-1),2)
        Z.append(Rmv - (output*Rmv))
        result.append(output)
    
    for value in range(0,15):
        C4 = (Rmv) - (result[value]) * (Rmv)
        Y.append(C4)   

    for value in range(15,30):                
        B11 = (SigD) - (result[value]) * (SigD)
        Y.append(B11)
          
    for x in range(0,30):    
        SigMean = ((SigS**M * (1-(Z[x]   SigS)**N/(Rmv   SigS)**N))**(1/M)) / K
        SigM.append(SigMean) 
    return Z, SigM


Z, SigM = Mittelspannung()
plt.figure()
plt.plot(Z, SigM)

CodePudding user response：

You didn't define Z in the function call. Depending on what tool your using, you should be able to see that in the error message, something like "Z is being used before initializing".