Rename example file so it is obviously an example

README.md

@@ -65,16 +65,11 @@ pip install pysr
 ```
 
 # Quickstart
-For a simple demo, start by navigating to the root directory and then in a terminal call 
-```
->> python main.py
-```
-<br>
-For a more hands on demo you can do the following (also in the root directory)
 
+Here is some demo code (also found in `example.py`)
 ```python
 import numpy as np
-from pysr import pysr, best, get_hof
+from pysr import pysr, best
 
 # Dataset
 X = 2*np.random.randn(100, 5)

main.py → example.py

@@ -1,19 +1,17 @@
 import numpy as np
-from pysr import pysr, best, get_hof
-import time
+from pysr import pysr, best
 
 # Dataset
 X = 2*np.random.randn(100, 5)
 y = 2*np.cos(X[:, 3]) + X[:, 0]**2 - 2
 
-
 # Learn equations
-start = time.time()
 equations = pysr(X, y, niterations=5,
-                binary_operators=["plus", "mult"],
-                unary_operators=["cos", "exp", "sin"])
+    binary_operators=["plus", "mult"],
+    unary_operators=[
+      "cos", "exp", "sin", #Pre-defined library of operators (see https://pysr.readthedocs.io/en/latest/docs/operators/)
+      "inv(x) = 1/x"]) # Define your own operator! (Julia syntax)
 
-...  # (you can use ctl-c to exit early)
+...# (you can use ctl-c to exit early)
 
 print(best(equations))
-print(f"Took {time.time()-start} seconds")