Plot graph in Python

Question

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

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())

43 return Z, SigM —> 44 plot.plot(Z, SigM) 45 plot.show() 46 print(Mittelspannung()) NameError: name ‘Z’ is not define

Asked By: Pavan Sai Jagarlamudi

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Source

Answer 1

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)

Answered By: Davide_sd

Answer 2

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".

Answered By: Ibrahim

Answer 3

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

this code will show you the error

#error

----> 1 Z, SigM = Mittelspannung()
      2 plt.figure()
      3 plt.plot(Z, SigM)

ValueError: too many values to unpack (expected 2)

// Try this one

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

Answered By: Gautam kumar jaiswal

Plot graph in Python

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