[Python] Trouble Plotting Data

I am new to Python. I am reading my adc data from file and generating 1-Dimensional numpy array. I have 1800 data over the period of 3 minutes so my sampling frequency is 10Hz. I want to plot this data but i am getting error

raise ValueError(f"x and y must have same first dimension, but "
f"have shapes {x.shape} and {y.shape}")


below is my code

import matplotlib.pyplot as plt
import numpy as np

arr1 = np.array

file_path = "MyValues.log" # Replace with the actual path to your file

fs = 10
T = 180.0 # seconds
n = int(T * fs) # total number of samples

try:

with open(file_path, 'r') as file:

for line in file:
# Each 'line' variable will contain one line from the file
# including the trailing newline character ('\n') if present.
# You can process the line here, for example, print it:
#print(str(counter) + " - " + line.strip()) # .strip() removes leading/trailing whitespace, including '\n'
arr1 = np.append(arr1, int(line.strip()))

except FileNotFoundError:
print(f"Error: The file '{file_path}' was not found.")
except Exception as e:
print(f"An error occurred: {e}")

print(len(arr1))

plt.figure(figsize=(10, 6)) # Set the figure size
plt.plot(n, arr1, marker='o', linestyle='-', color='purple')
plt.title('Plot of 1D Array Data')
plt.xlabel('Index')
plt.ylabel('Value')
plt.grid(True)
plt.xticks(n) # Ensure x-axis ticks align with indices
plt.show()


Any help please.

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