title: How to change the legend of each datapoint?
body: <p>I want to compare experimental curve against a bunch of simulations data. The simulations tries to replicate a single point of the curve.</p>
  
  <p>I can plot both the curve and the plots together, however the legend isn't what I need. </p>
  
  <pre><code>x_simu = AoA_mean
  y_simu = Cl_mean
  
  x_exp = AoA_cl_DanAero
  y_exp =CL_DanAero
  
  df1 = data.frame(x_simu, y_simu)
  df2 = data.frame(x_exp, y_exp)
  
  ggplot(data = df1, mapping = aes(x_simu, y_simu))+
    geom_point(aes(color = y_simu))+
    geom_point(data = df2 ,mapping = aes(x_exp, y_exp))+
    geom_line(data = df2 ,mapping = aes(x_exp, y_exp))
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/ne0Ss.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ne0Ss.png" alt="ggplot comparing experiment vs simualtions"></a></p>
  
  <p>I would like that each simulation point get its own color and its own name in the legend. </p>
  
  <p>I feel that I should use the "factor" format of R but I wasn't able to combine the curve with the simulations if I do it.</p>
  
  <pre><code>x_simu = as.factor(x_simu)
  y_simu = as.factor(y_simu)
  ggplot(data = df1, aes(x_simu, y_simu,color = legend_label))+
    geom_point()
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/dpEXE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dpEXE.png" alt="enter image description here"></a></p>
  
  <p>I would like to have the legend of the 2nd plot in the 1st plot.</p>