01-NumPy Arrays.ipynb

{"cells":[{"cell_type":"markdown","metadata":{"id":"LufgGh4yW3XK"},"source":["# NumPy \n","\n","NumPy (or Numpy) is a Linear Algebra Library for Python, the reason it is so important for Data Science with Python is that almost all of the libraries in the PyData Ecosystem rely on NumPy as one of their main building blocks.\n","\n","Numpy is also incredibly fast, as it has bindings to C libraries. For more info on why you would want to use Arrays instead of lists, check out this great [StackOverflow post](http://stackoverflow.com/questions/993984/why-numpy-instead-of-python-lists).\n","\n","We will only learn the basics of NumPy, to get started we need to install it!"]},{"cell_type":"markdown","metadata":{"id":"-I1izoWRW3XL"},"source":["## Installation Instructions\n","\n","**It is highly recommended you install Python using the Anaconda distribution to make sure all underlying dependencies (such as Linear Algebra libraries) all sync up with the use of a conda install. If you have Anaconda, install NumPy by going to your terminal or command prompt and typing:**\n","    \n","    conda install numpy\n","    \n","**If you do not have Anaconda and can not install it, please refer to [Numpy's official documentation on various installation instructions.](http://docs.scipy.org/doc/numpy-1.10.1/user/install.html)**"]},{"cell_type":"markdown","metadata":{"id":"j66itRjpW3XM"},"source":["## Using NumPy\n","\n","Once you've installed NumPy you can import it as a library:"]},{"cell_type":"code","execution_count":1,"metadata":{"collapsed":true,"executionInfo":{"elapsed":2820,"status":"ok","timestamp":1614544684604,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"lHITn8QSW3XM"},"outputs":[],"source":["import numpy as np"]},{"cell_type":"markdown","metadata":{"id":"yK3EQlYoW3XN"},"source":["Numpy has many built-in functions and capabilities. We won't cover them all but instead we will focus on some of the most important aspects of Numpy: vectors,arrays,matrices, and number generation. Let's start by discussing arrays.\n","\n","# Numpy Arrays\n","\n","NumPy arrays are the main way we will use Numpy throughout the course. Numpy arrays essentially come in two flavors: vectors and matrices. Vectors are strictly 1-d arrays and matrices are 2-d (but you should note a matrix can still have only one row or one column).\n","\n","Let's begin our introduction by exploring how to create NumPy arrays.\n","\n","## Creating NumPy Arrays\n","\n","### From a Python List\n","\n","We can create an array by directly converting a list or list of lists:"]},{"cell_type":"code","execution_count":2,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5517,"status":"ok","timestamp":1614544687387,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"3UPO-BU1W3XO","outputId":"4f6e11dc-8577-4741-c7f0-04b1de4c0bbc"},"outputs":[{"data":{"text/plain":["[1, 2, 3]"]},"execution_count":2,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["my_list = [1,2,3]\n","my_list"]},{"cell_type":"code","execution_count":3,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5489,"status":"ok","timestamp":1614544687391,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"d1-olWpRW3XQ","outputId":"875f5866-6345-44e8-ec28-11fbe8c2fc83"},"outputs":[{"data":{"text/plain":["array([1, 2, 3])"]},"execution_count":3,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.array(my_list)"]},{"cell_type":"code","execution_count":4,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5471,"status":"ok","timestamp":1614544687394,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"n4l6YVKhW3XR","outputId":"4852181b-2a2f-40b1-fc99-e8907a51a412"},"outputs":[{"data":{"text/plain":["[[1, 2, 3], [4, 5, 6], [7, 8, 9]]"]},"execution_count":4,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["my_matrix = [[1,2,3],[4,5,6],[7,8,9]]\n","my_matrix"]},{"cell_type":"code","execution_count":5,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5452,"status":"ok","timestamp":1614544687395,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"04giGZzAW3XR","outputId":"a80414fd-8f3f-43db-fde3-df9a51cdf1c3"},"outputs":[{"data":{"text/plain":["array([[1, 2, 3],\n","       [4, 5, 6],\n","       [7, 8, 9]])"]},"execution_count":5,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.array(my_matrix)"]},{"cell_type":"markdown","metadata":{"id":"4fcAD0uvW3XS"},"source":["## Built-in Methods\n","\n","There are lots of built-in ways to generate Arrays"]},{"cell_type":"markdown","metadata":{"id":"Bck7BMwfW3XS"},"source":["### arange\n","\n","Return evenly spaced values within a given interval."]},{"cell_type":"code","execution_count":6,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5437,"status":"ok","timestamp":1614544687396,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"2KDi9z7gW3XT","outputId":"f85c9b39-e58f-45a6-b7f1-b3d9ea8e50c2"},"outputs":[{"data":{"text/plain":["array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])"]},"execution_count":6,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.arange(0,10)"]},{"cell_type":"code","execution_count":7,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5421,"status":"ok","timestamp":1614544687397,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"adN4foVlW3XT","outputId":"8e55d780-cdfa-4ee5-886f-953b8dfda4ae"},"outputs":[{"data":{"text/plain":["array([ 0,  2,  4,  6,  8, 10])"]},"execution_count":7,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.arange(0,11,2)"]},{"cell_type":"markdown","metadata":{"id":"BESTMhJDW3XU"},"source":["### zeros and ones\n","\n","Generate arrays of zeros or ones"]},{"cell_type":"code","execution_count":8,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5402,"status":"ok","timestamp":1614544687398,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"Co3Bnb_jW3XU","outputId":"39347ff8-b20f-45dd-8d8c-8fec7067e538"},"outputs":[{"data":{"text/plain":["array([0., 0., 0.])"]},"execution_count":8,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.zeros(3)"]},{"cell_type":"code","execution_count":9,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5382,"status":"ok","timestamp":1614544687399,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"OjXwMhHhW3XV","outputId":"26efb38e-9f75-48ab-cf67-c6b1d057c11b"},"outputs":[{"data":{"text/plain":["array([[0., 0., 0., 0., 0.],\n","       [0., 0., 0., 0., 0.],\n","       [0., 0., 0., 0., 0.],\n","       [0., 0., 0., 0., 0.],\n","       [0., 0., 0., 0., 0.]])"]},"execution_count":9,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.zeros((5,5))"]},{"cell_type":"code","execution_count":10,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5364,"status":"ok","timestamp":1614544687400,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"HMM6LCfqW3XW","outputId":"e2a31ac9-539b-43ed-dabe-f999fb47c188"},"outputs":[{"data":{"text/plain":["array([1., 1., 1.])"]},"execution_count":10,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.ones(3)"]},{"cell_type":"code","execution_count":11,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5349,"status":"ok","timestamp":1614544687401,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"J7IGbf37W3XW","outputId":"7423f608-ce53-4582-b932-87eff0694939"},"outputs":[{"data":{"text/plain":["array([[1., 1., 1.],\n","       [1., 1., 1.],\n","       [1., 1., 1.]])"]},"execution_count":11,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.ones((3,3))"]},{"cell_type":"markdown","metadata":{"id":"MJB7Fq6QW3XX"},"source":["### linspace\n","Return evenly spaced numbers over a specified interval."]},{"cell_type":"code","execution_count":12,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5331,"status":"ok","timestamp":1614544687402,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"MgRI14ktW3XX","outputId":"070d55c6-f931-4232-c299-2dc2c3ab2e82"},"outputs":[{"data":{"text/plain":["array([ 0.,  5., 10.])"]},"execution_count":12,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.linspace(0,10,3)"]},{"cell_type":"code","execution_count":13,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5310,"status":"ok","timestamp":1614544687403,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"Jony2runW3XY","outputId":"a472d0c9-b5f1-47d5-c6d6-0af5d536c163"},"outputs":[{"data":{"text/plain":["array([ 0.        ,  0.20408163,  0.40816327,  0.6122449 ,  0.81632653,\n","        1.02040816,  1.2244898 ,  1.42857143,  1.63265306,  1.83673469,\n","        2.04081633,  2.24489796,  2.44897959,  2.65306122,  2.85714286,\n","        3.06122449,  3.26530612,  3.46938776,  3.67346939,  3.87755102,\n","        4.08163265,  4.28571429,  4.48979592,  4.69387755,  4.89795918,\n","        5.10204082,  5.30612245,  5.51020408,  5.71428571,  5.91836735,\n","        6.12244898,  6.32653061,  6.53061224,  6.73469388,  6.93877551,\n","        7.14285714,  7.34693878,  7.55102041,  7.75510204,  7.95918367,\n","        8.16326531,  8.36734694,  8.57142857,  8.7755102 ,  8.97959184,\n","        9.18367347,  9.3877551 ,  9.59183673,  9.79591837, 10.        ])"]},"execution_count":13,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.linspace(0,10,50)"]},{"cell_type":"markdown","metadata":{"id":"XeKzfVMWW3XY"},"source":["## eye\n","\n","Creates an identity matrix"]},{"cell_type":"code","execution_count":14,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5280,"status":"ok","timestamp":1614544687404,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"Zq0DeaIGW3XY","outputId":"631a2c65-23ca-42f2-c654-2271e6bd45de"},"outputs":[{"data":{"text/plain":["array([[1., 0., 0., 0.],\n","       [0., 1., 0., 0.],\n","       [0., 0., 1., 0.],\n","       [0., 0., 0., 1.]])"]},"execution_count":14,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.eye(4)"]},{"cell_type":"markdown","metadata":{"id":"-sLiH37hW3XZ"},"source":["## Random \n","\n","Numpy also has lots of ways to create random number arrays:\n","\n","### rand\n","Create an array of the given shape and populate it with\n","random samples from a uniform distribution\n","over ``[0, 1)``."]},{"cell_type":"code","execution_count":15,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5255,"status":"ok","timestamp":1614544687405,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"9Yu7WSr2W3XZ","outputId":"2b08a41d-96ca-4639-8e16-aeef6b31b55d"},"outputs":[{"data":{"text/plain":["array([0.33932046, 0.95919271])"]},"execution_count":15,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.random.rand(2)"]},{"cell_type":"code","execution_count":16,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5236,"status":"ok","timestamp":1614544687406,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"ei3PtrmaW3Xa","outputId":"d49dc700-586a-420a-8da3-e6597bce7281"},"outputs":[{"data":{"text/plain":["array([[5.91781059e-01, 5.36918166e-03, 3.36043667e-01, 9.49785166e-01,\n","        5.55912642e-01],\n","       [2.96170475e-01, 6.56096495e-01, 3.13158262e-01, 8.87472404e-01,\n","        6.58126799e-01],\n","       [5.94303599e-01, 7.92749870e-01, 5.62310995e-01, 7.99318113e-01,\n","        1.04355671e-01],\n","       [7.59355440e-01, 1.14567248e-01, 7.16447022e-04, 1.48493361e-01,\n","        9.29989955e-01],\n","       [9.14334615e-01, 2.54168359e-01, 9.86232961e-01, 1.47402218e-01,\n","        9.83717069e-01]])"]},"execution_count":16,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.random.rand(5,5)"]},{"cell_type":"markdown","metadata":{"id":"5tht43RsW3Xa"},"source":["### randn\n","\n","Return a sample (or samples) from the \"standard normal\" distribution. Unlike rand which is uniform:"]},{"cell_type":"code","execution_count":17,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5217,"status":"ok","timestamp":1614544687407,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"99__WAERW3Xa","outputId":"42cc09b4-cdcf-44c2-aded-f344abc77c3a"},"outputs":[{"data":{"text/plain":["array([-0.77078011, -0.08007518])"]},"execution_count":17,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.random.randn(2)"]},{"cell_type":"code","execution_count":18,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5194,"status":"ok","timestamp":1614544687408,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"EWJuYqaLW3Xb","outputId":"23b169c3-5971-4019-8ff9-affe057be9a1"},"outputs":[{"data":{"text/plain":["array([[-0.71110692, -1.55015091,  1.84363036,  0.12126421, -0.33331416],\n","       [-0.11818063,  1.11787155,  0.98571159, -0.76709396, -0.66228083],\n","       [-0.84429389, -0.61511139, -0.1714862 ,  1.47306124, -0.17369665],\n","       [ 1.96037773,  0.75428208,  2.15978017, -0.36119091,  0.20385794],\n","       [-0.7945303 , -0.09782684, -0.27263769, -1.12158003, -1.98188109]])"]},"execution_count":18,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.random.randn(5,5)"]},{"cell_type":"markdown","metadata":{"id":"UCXrKXymW3Xb"},"source":["### randint\n","Return random integers from `low` (inclusive) to `high` (exclusive)."]},{"cell_type":"code","execution_count":19,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5179,"status":"ok","timestamp":1614544687409,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"CE_4ssHUW3Xb","outputId":"419ddf32-e907-40f1-d83f-5c2498d70cc1"},"outputs":[{"data":{"text/plain":["28"]},"execution_count":19,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.random.randint(1,100)"]},{"cell_type":"code","execution_count":20,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5164,"status":"ok","timestamp":1614544687410,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"d_lKJvODW3Xc","outputId":"d5891545-89be-4421-b57e-05b5e368c7b4"},"outputs":[{"data":{"text/plain":["array([63, 45, 82, 44, 40, 95, 72,  6, 82, 16])"]},"execution_count":20,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["np.random.randint(1,100,10)"]},{"cell_type":"markdown","metadata":{"id":"LbllTNTQW3Xc"},"source":["## Array Attributes and Methods\n","\n","Let's discuss some useful attributes and methods or an array:"]},{"cell_type":"code","execution_count":21,"metadata":{"collapsed":true,"executionInfo":{"elapsed":5160,"status":"ok","timestamp":1614544687411,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"5NmMQD5TW3Xd"},"outputs":[],"source":["arr = np.arange(25)\n","ranarr = np.random.randint(0,50,10)"]},{"cell_type":"code","execution_count":22,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5142,"status":"ok","timestamp":1614544687412,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"p4kPeWR5W3Xd","outputId":"196f0b5d-642a-4455-8336-a52045b1dce8"},"outputs":[{"data":{"text/plain":["array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16,\n","       17, 18, 19, 20, 21, 22, 23, 24])"]},"execution_count":22,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["arr"]},{"cell_type":"code","execution_count":23,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5128,"status":"ok","timestamp":1614544687413,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"2eaSka9cW3Xe","outputId":"530003a9-11b7-4f80-844b-492d61c540af"},"outputs":[{"data":{"text/plain":["array([42,  9, 42,  4,  5, 11, 21, 47, 34, 33])"]},"execution_count":23,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["ranarr"]},{"cell_type":"markdown","metadata":{"id":"bnyDg1BkW3Xe"},"source":["## Reshape\n","Returns an array containing the same data with a new shape."]},{"cell_type":"code","execution_count":24,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5113,"status":"ok","timestamp":1614544687414,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"BO_COLjVW3Xe","outputId":"88097802-1404-40d6-cbed-de13846dace0"},"outputs":[{"data":{"text/plain":["array([[ 0,  1,  2,  3,  4],\n","       [ 5,  6,  7,  8,  9],\n","       [10, 11, 12, 13, 14],\n","       [15, 16, 17, 18, 19],\n","       [20, 21, 22, 23, 24]])"]},"execution_count":24,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["arr.reshape(5,5)"]},{"cell_type":"markdown","metadata":{"id":"fp9ZqudXW3Xf"},"source":["### max,min,argmax,argmin\n","\n","These are useful methods for finding max or min values. Or to find their index locations using argmin or argmax"]},{"cell_type":"code","execution_count":25,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5098,"status":"ok","timestamp":1614544687415,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"L9FlKAuJW3Xf","outputId":"2e6e62ce-f735-41a8-8a6c-568a20fe810a"},"outputs":[{"data":{"text/plain":["array([42,  9, 42,  4,  5, 11, 21, 47, 34, 33])"]},"execution_count":25,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["ranarr"]},{"cell_type":"code","execution_count":26,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5083,"status":"ok","timestamp":1614544687416,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"vK4L9xYAW3Xg","outputId":"7673de66-578f-4c76-92bd-e2a3cf75d437"},"outputs":[{"data":{"text/plain":["47"]},"execution_count":26,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["ranarr.max()"]},{"cell_type":"code","execution_count":27,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5065,"status":"ok","timestamp":1614544687417,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"AdBLV4OjW3Xg","outputId":"dda920b1-8cda-4db6-af7c-12eae02728c8"},"outputs":[{"data":{"text/plain":["7"]},"execution_count":27,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["ranarr.argmax() # returns the index with the Maximum value."]},{"cell_type":"code","execution_count":28,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5050,"status":"ok","timestamp":1614544687417,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"RxBPL71LW3Xg","outputId":"8fa2636b-2355-422f-be25-d94e337c771b"},"outputs":[{"data":{"text/plain":["4"]},"execution_count":28,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["ranarr.min()"]},{"cell_type":"code","execution_count":29,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5035,"status":"ok","timestamp":1614544687418,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"6WzAmsKMW3Xh","outputId":"4795aa65-9875-4480-8a70-312ac8fe7a92"},"outputs":[{"data":{"text/plain":["3"]},"execution_count":29,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["ranarr.argmin() ## returns the index with the Minum value."]},{"cell_type":"markdown","metadata":{"id":"ON334nrWW3Xi"},"source":["## Shape\n","\n","Shape is an attribute that arrays have (not a method):"]},{"cell_type":"code","execution_count":30,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5022,"status":"ok","timestamp":1614544687419,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"bikwIr67W3Xi","outputId":"d9463d9b-e705-49af-ea7b-9d03aacce6f4"},"outputs":[{"data":{"text/plain":["(25,)"]},"execution_count":30,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["# Vector\n","arr.shape"]},{"cell_type":"code","execution_count":31,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":5010,"status":"ok","timestamp":1614544687420,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"4dQLIgn4W3Xj","outputId":"98098284-4ed1-4779-d194-23d99f5bb1a4"},"outputs":[{"data":{"text/plain":["array([[ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,\n","        16, 17, 18, 19, 20, 21, 22, 23, 24]])"]},"execution_count":31,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["# Notice the two sets of brackets\n","arr.reshape(1,25)"]},{"cell_type":"code","execution_count":32,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":4997,"status":"ok","timestamp":1614544687421,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"A6j8Boa9W3Xk","outputId":"d3ee0b78-41c9-42b9-b92f-6716664c9cb2"},"outputs":[{"data":{"text/plain":["(1, 25)"]},"execution_count":32,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["arr.reshape(1,25).shape"]},{"cell_type":"code","execution_count":33,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":4985,"status":"ok","timestamp":1614544687422,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"4ukVg8vpW3Xm","outputId":"62ef029e-9dd7-4b49-db1f-4e4f16e7c46e"},"outputs":[{"data":{"text/plain":["array([[ 0],\n","       [ 1],\n","       [ 2],\n","       [ 3],\n","       [ 4],\n","       [ 5],\n","       [ 6],\n","       [ 7],\n","       [ 8],\n","       [ 9],\n","       [10],\n","       [11],\n","       [12],\n","       [13],\n","       [14],\n","       [15],\n","       [16],\n","       [17],\n","       [18],\n","       [19],\n","       [20],\n","       [21],\n","       [22],\n","       [23],\n","       [24]])"]},"execution_count":33,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["arr.reshape(25,1)"]},{"cell_type":"code","execution_count":34,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":4972,"status":"ok","timestamp":1614544687423,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"nmOoLXkiW3Xn","outputId":"70e569d8-9009-49da-9d12-2c425a7f81d9"},"outputs":[{"data":{"text/plain":["(25, 1)"]},"execution_count":34,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["arr.reshape(25,1).shape"]},{"cell_type":"markdown","metadata":{"id":"43gPHrUrW3Xo"},"source":["### dtype\n","\n","You can also grab the data type of the object in the array:"]},{"cell_type":"code","execution_count":35,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"executionInfo":{"elapsed":4960,"status":"ok","timestamp":1614544687424,"user":{"displayName":"faizy","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14Gi9OnkER3xzaOlgnoeS9xNlzHdkqyRS2s8PTotHkw=s64","userId":"00466318749872658969"},"user_tz":-330},"id":"VaeF8kTNW3Xp","outputId":"8385a85c-6f47-4348-eedb-625473cf973c"},"outputs":[{"data":{"text/plain":["dtype('int64')"]},"execution_count":35,"metadata":{"tags":[]},"output_type":"execute_result"}],"source":["arr.dtype"]}],"metadata":{"colab":{"name":"01-NumPy Arrays.ipynb","provenance":[]},"kernelspec":{"display_name":"Python 3","language":"python","name":"python3"},"language_info":{"codemirror_mode":{"name":"ipython","version":3},"file_extension":".py","mimetype":"text/x-python","name":"python","nbconvert_exporter":"python","pygments_lexer":"ipython3","version":"3.6.2"}},"nbformat":4,"nbformat_minor":0}