Merge pull request #185 from rsokl/numpy-random

numpy.random: fix broken link and update syntax to use new RNG system

Author: rsokl

Python/Module3_IntroducingNumpy/FunctionsForCreatingNumpyArrays.md

@@ -150,19 +150,22 @@ Numpy has other functions for creating sequential arrays, such as producing an a
 ## Creating Arrays Using Random Sampling
 Several functions can be accessed from `np.random`, which populate arrays of a user-specified shape by drawing randomly from a specified statistical distribution:
 ```python
+# construct a new random number generator
+>>> rng = np.random.default_rng()
+
 # create a shape-(3,3) array by drawing its entries randomly
 # from the uniform distribution [0, 1) 
->>> np.random.rand(3,3)
+>>> rng.random((3, 3))
 array([[ 0.09542611,  0.13183498,  0.39836068],
        [ 0.7358235 ,  0.77640024,  0.74913595],
        [ 0.37702688,  0.86617624,  0.39846429]])
 
 # create a shape-(5,) array by drawing its entries randomly
 # from a mean-0, variance-1 normal (a.k.a. Gaussian) distribution
->>> np.random.randn(5)
+>>> rng.normal(size=(5,))
 array([-1.11262121, -0.35392007,  0.4245215 , -0.81995588,  0.65412323])
 ```
-There are [many more functions](https://numpy.org/doc/stable/reference/routines.random.html#distributions) to read about that allow you to draw from a wide variety of statistical distributions. This only scratches the surface of random number generation in NumPy.
+There are [many more functions](https://numpy.org/doc/stable/reference/random/generator.html#simple-random-data) to read about that allow you to draw from a wide variety of statistical distributions. This only scratches the surface of random number generation in NumPy.
 
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