Valueerror: either both or neither of x and y should be given

ValueError: either both or neither of x and y should be given

This error occurs when using certain functions or methods that require both parameters to be provided, but only one of them is given, or when neither parameter is provided.

To better understand this error, let’s go through some examples:

• Example 1: plotting a graph using matplotlib library

                  
  import matplotlib.pyplot as plt
  
  x = [1, 2, 3, 4, 5]
  y = [4, 2, 5, 1, 6]
  
  plt.plot(x, y)
  plt.show()
                  
              

  In this example, we provided both the x and y values to the plt.plot() function, so it will generate a graph correctly.

• Example 2: incorrectly providing only one parameter

                  
  import matplotlib.pyplot as plt
  
  x = [1, 2, 3, 4, 5]
  y = [4, 2, 5, 1, 6]
  
  plt.plot(x)
  plt.show()
                  
              

  Here, we made a mistake by only providing the x parameter to the plt.plot() function. This results in the ValueError because the function needs both x and y values to plot the graph.

• Example 3: forgetting to provide both parameters

                  
  import matplotlib.pyplot as plt
  
  x = [1, 2, 3, 4, 5]
  y = [4, 2, 5, 1, 6]
  
  plt.plot()
  plt.show()
                  
              

  In this case, we forgot to provide both x and y values to the plt.plot() function. Again, this results in a ValueError.

To solve this error, make sure to provide both parameters (x and y) when required, or remove both parameters if they are not needed for the particular function or method you are using.