title: Why do I keep on getting "x and y must have same first dimension, but have shapes (100,) and (1, 100)"?
body: <p>I have been trying to create a plot with a colourbar, with a code that I have previously used, but this time I changed the equation that represents the values for the y-axis. The code is below:</p>
  <pre><code>import numpy as np
  import matplotlib
  import matplotlib as plt
  
  
  θ= [0.01, 1, 2, 3, 4, 5] #values for the colourbar to use in equation in for loop
  x=np.linspace[0.1, 8, 100]
  y=1/(np.exp(x)+1)       #factor used in equation dependent on the x-axis values
  a=(5.3)*10**4           # constant for the equation
  
  norm = matplotlib.colors.Normalize(vmin=np.min(θ), vmax=np.max(θ))  #colourbar max and min values
  c_m = matplotlib.cm.cool
  s_m = matplotlib.cm.ScalarMappable(cmap='jet', norm=norm)
  
  s_m.set_array([])
  
  #below is the for loop that uses one value of θ at a time, represented as t in the equation
  
  
  for t in θ:            
      plt.plot(x, a*y*x*[np.pi/(4*x) - (np.arctan(x*t**3)+ (t**3)/(1 + (t**6) * x**2))], color=s_m.to_rgba(t)) 
  
  func = lambda x,pos: &quot;{:g}&quot;.format(x *100000)
  fmt = matplotlib.ticker.FuncFormatter(func)
  
  c_bar=plt.colorbar(s_m, format=fmt)
  
  plt.legend()
  plt.xlabel('y=E/T')
  plt.ylabel('$f_{ν_s}$')
  c_bar.set_label(r'$ \theta \times 10^{-5}$ rads')
  plt.show()
  </code></pre>
  <p>The problem with this code, is that it constantly gives me the following error message:</p>
  <p><em>&quot;x and y must have same first dimension, but have shapes (100,) and (1, 100)&quot;</em></p>
  <p><strong>I have checked the equations multiple times but I still don't understand what is wrong. Initially I thought that changing my x-range not to have 0 as its lowest limit would do the trick, but it did not and the same message appears.</strong></p>
  <p>I have looked into questions with a similar problem (<a href="https://stackoverflow.com/questions/26690480/matplotlib-valueerror-x-and-y-must-have-same-first-dimension">Matplotlib: ValueError: x and y must have same first dimension</a>)  but I'm still unable to solve this problem</p>