Update app.py

app.py

@@ -1,4 +1,17 @@
 import streamlit as st
+import numpy as np
+import matplotlib.pyplot as plt
 
-x = st.slider('Select a value')
-st.write(x, 'squared is', x * x)
+number_of_observations = st.slider('Number of observations', min_value=50, max_value=150)
+X = np.column_stack((np.ones(number_of_observations), 
+                     np.random.random(number_of_observations))     
+                                    
+fig = plt.figure(dpi=80, figsize=(7,7))
+ax = fig.add_subplot(111)
+ax.set_xlim((0,1))
+ax.set_ylim((-5,20))
+plt.scatter(X[:,1], y, c='r', edgecolors='#fda172')
+line_thickness = 2
+line, = ax.plot([], [], lw=line_thickness)
+st.pyplot(fig)
+st.write(X[:5, :])