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NumPy: Create a two-dimensional array of specified format

NumPy: Basic Exercise-46 with Solution

Write a NumPy program to create a two-dimensional array of specified format.

Sample format:

[[  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  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]
 [ 51  52  53  54  55  56  57  58  59  60]
 [ 61  62  63  64  65  66  67  68  69  70]
 [ 71  72  73  74  75  76  77  78  79  80]
 [ 81  82  83  84  85  86  87  88  89  90]
 [ 91  92  93  94  95  96  97  98  99 100]
 [101 102 103 104 105 106 107 108 109 110]
 [111 112 113 114 115 116 117 118 119 120]
 [121 122 123 124 125 126 127 128 129 130]
 [131 132 133 134 135 136 137 138 139 140]
 [141 142 143 144 145 146 147 148 149 150]]

Sample Solution :

Python Code :

import numpy as np   
print("Create an array of shape (15,10):") 
print("Command-1")
print(np.arange(1, 151).reshape(15, 10)) 
print("\nCommand-2")
print(np.arange(1, 151).reshape(-1, 10)) 
print("\nCommand-3")
print(np.arange(1, 151).reshape(15, -1))

Sample Output:

Create an array of shape (15,10):
Command-1
[[  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  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]
 [ 51  52  53  54  55  56  57  58  59  60]
 [ 61  62  63  64  65  66  67  68  69  70]
 [ 71  72  73  74  75  76  77  78  79  80]
 [ 81  82  83  84  85  86  87  88  89  90]
 [ 91  92  93  94  95  96  97  98  99 100]
 [101 102 103 104 105 106 107 108 109 110]
 [111 112 113 114 115 116 117 118 119 120]
 [121 122 123 124 125 126 127 128 129 130]
 [131 132 133 134 135 136 137 138 139 140]
 [141 142 143 144 145 146 147 148 149 150]]

Command-2
[[  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  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]
 [ 51  52  53  54  55  56  57  58  59  60]
 [ 61  62  63  64  65  66  67  68  69  70]
 [ 71  72  73  74  75  76  77  78  79  80]
 [ 81  82  83  84  85  86  87  88  89  90]
 [ 91  92  93  94  95  96  97  98  99 100]
 [101 102 103 104 105 106 107 108 109 110]
 [111 112 113 114 115 116 117 118 119 120]
 [121 122 123 124 125 126 127 128 129 130]
 [131 132 133 134 135 136 137 138 139 140]
 [141 142 143 144 145 146 147 148 149 150]]

Command-3
[[  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  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]
 [ 51  52  53  54  55  56  57  58  59  60]
 [ 61  62  63  64  65  66  67  68  69  70]
 [ 71  72  73  74  75  76  77  78  79  80]
 [ 81  82  83  84  85  86  87  88  89  90]
 [ 91  92  93  94  95  96  97  98  99 100]
 [101 102 103 104 105 106 107 108 109 110]
 [111 112 113 114 115 116 117 118 119 120]
 [121 122 123 124 125 126 127 128 129 130]
 [131 132 133 134 135 136 137 138 139 140]
 [141 142 143 144 145 146 147 148 149 150]]

Python-Numpy Code Editor:

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m