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# NumPy Review…Again;)

## Python Review Free Exercises — #PySeries#Episode 16

01#PyEx — Python —NumPy — Importing Libs:

`#Import NumPy as np:`

02#PyEx — Python — NumPy — Zeros:

`#Create an array of 10 zeros:# output expected: array([0., 0., 0., 0., 0., 0., 0., 0., 0., 0.])`

03#PyEx — Python — NumPy — Ones:

`#Create an array of 10 ones:# output expected: array([1., 1., 1., 1., 1., 1., 1., 1., 1., 1.])`

04#PyEx — Python — NumPy — Ones:

`#Create an array of 10 fives:# output expected: array([5., 5., 5., 5., 5., 5., 5., 5., 5., 5.])`

05#PyEx — Python — NumPy — Integers:

`#Create an array of the integers from 10 to 50:# output expected: array([10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43,44, 45, 46, 47, 48, 49, 50])`

06#PyEx — Python — NumPy — Arange:

`#Create an array of all the even integers from 10 to 50:# output expected: array([10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50])`

07#PyEx — Python — NumPy —Arange :

`#Create a 3x3 matrix with values ranging from 0 to 8:# output expected: array([[0, 1, 2],[3, 4, 5],[6, 7, 8]])`

08#PyEx — Python — NumPy —Identity Matrix :

`#Create a 3x3 identity matrix:# output expected: array([[1., 0., 0.],[0., 1., 0.],[0., 0., 1.]])`

09#PyEx — Python — NumPy — Random Numbers:

`#Use NumPy to generate a random number between 0 and 1:#NOTE: Your result’s value should be different from the one shown #below.# output expected: array([0.23442116])`

10#PyEx — Python — NumPy — Random Numbers:

`#Use NumPy to generate an array of 25 random numbers sampled from a standard normal distribution:#NOTE: Your result’s values should be different from the ones shown below.# output expected: array([-0.61659542, -0.77532828, 0.36213786, -1.28636974, 0.33286861, 0.06991562, 0.99519046, -1.12320101, -2.09591218, -0.99818646, -0.86720284, -1.13239342, -0.17099943, -0.76632253, -1.005097 , -1.73123788, -1.28889203, -1.63121734, -0.32411105, -0.30448115, -0.67660156, -1.1030128 , -1.19426878, 1.10254174, 1.30879357])`

11#PyEx — Python — NumPy —Numbers generators:

`#Create the following matrix:# output expected: array([[0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1 ],[0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2 ],[0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3 ],[0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4 ],[0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5 ],[0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6 ],[0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7 ],[0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8 ],[0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9 ],[0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1. ]])`

12#PyEx — Python — Numpy —Spaced Intervals :

`#Create an array of 20 linearly spaced points between 0 and 1:# output expected: array([0. , 0.05263158, 0.10526316, 0.15789474, 0.21052632, 0.26315789, 0.31578947, 0.36842105, 0.42105263, 0.47368421, 0.52631579, 0.57894737, 0.63157895, 0.68421053, 0.73684211, 0.78947368, 0.84210526, 0.89473684, 0.94736842, 1. ])`

Alright, now you will be given a starting matrix, and you will replicate the matrix outputs

IMPORTANT NOTE: Do not forget to run the cell below!

`#RUN THIS CELL — THIS IS OUR STARTING MATRIX:mat = np.arange(1,26).reshape(5,5)# output expected:array([[ 1,  2,  3,  4,  5],        [ 6,  7,  8,  9, 10],        [11, 12, 13, 14, 15],        [16, 17, 18, 19, 20],        [21, 22, 23, 24, 25]])`

13#PyEx — Python — NumPy — Indexing & Slicing:

`#Write code that reproduces the output shown below:# output expected: array([[12, 13, 14, 15],[17, 18, 19, 20],[22, 23, 24, 25]])`

14#PyEx — Python — NumPy — Indexing & Slicing:

`#Write code that reproduces the output shown below:# output expected: 20`

15#PyEx — Python — NumPy —Indexing & Slicing :

`#Write code that reproduces the output shown below:# output expected:array([[ 2],[ 7],[12]])`

16#PyEx — Python — NumPy —Indexing & Slicing :

`#Write code that reproduces the output shown below:# output expected: array([21, 22, 23, 24, 25])`

17#PyEx — Python — NumPy —Indexing & Slicing :

`#Write code that reproduces the output shown below:# output expected: array([[16, 17, 18, 19, 20],[21, 22, 23, 24, 25]])`

18#PyEx — Python — NumPy —Stats & Math :

`#Get the sum of all the values in mat:# output expected: 325`

19#PyEx — Python — NumPy —Stats & Math :

`#Get the standard deviation of the values in mat:# output expected:7.211102550927978`

20#PyEx — Python — NumPy —Stats & Math :

`#Get the sum of all the columns in mat:# output expected: array([55, 60, 65, 70, 75])`

That`s it !

Get the original notebook e the notebook answer:).

See you soon!

Bye!

o/

# Credits & References

https://www.huawei.com/en/

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## J3

Hi, Guys o/ I am J3! I am just a hobby-dev, playing around with Python, Django, Lego, Arduino, Raspy, PIC, AI… Welcome! Join us!