added view() in md file

content/numpy/concepts/ndarray/terms/view/view.md

@@ -0,0 +1,114 @@
+---
+Title: '.view()'
+Description: 'Returns a new view of the array (shallow reference) that shares the original array’s data buffer.'
+Subjects:
+  - 'Computer Science'
+  - 'Data Science'
+Tags:
+  - 'Arrays'
+  - 'Methods'
+  - 'NumPy'
+  - 'Objects'
+CatalogContent:
+  - 'learn-python-3'
+  - 'paths/computer-science'
+---
+
+The **`.view()`** method returns a new array object that looks at the same data as the original array. The returned object is a _view_ ((shallow reference) that shares the same memory buffer. Modifying the contents of the view generally affects the original array.
+
+The method also allows reinterpreting the data with a different `dtype` or creating a subclass of `ndarray` using the `type` parameter. If a completely independent copy is needed, `.copy()` should be used instead.
+
+## Syntax
+
+```pseudo
+ndarray.view([dtype=None][, type=None])
+```
+
+**Parameters:**
+
+- `dtype` (optional): Data type to force the returned view to use. Reinterprets the underlying bytes with the specified dtype; this may affect shape requirements.
+- `type` (optional): If provided, the returned object will be a subclass of `ndarray` (e.g., `numpy.matrix`) instead of a plain `ndarray`.
+
+**Return value:**
+
+Returns a new array object (an `ndarray` or an instance of the specified `type`) that shares the same data buffer as the original unless the interpretation prevents sharing.
+
+> **Note:** `.view()` creates a shallow view — it does not copy array data. Use `.copy()` to create an independent array.
+
+## Example
+
+In this example, a view of a NumPy array is created that shares the original array’s memory, so modifications to the view also affect the original array:
+
+```py
+import numpy as np
+
+# create an array and a view
+arr = np.arange(6).reshape(2, 3)
+v = arr.view()
+
+print('Original arr:')
+print(arr)
+
+# modify the view
+v[0, 0] = 99
+
+print('\nModified view v:')
+print(v)
+
+print('\nOriginal arr after modifying v (shares memory):')
+print(arr)
+```
+
+The output of this code is:
+
+```shell
+Original arr:
+[[0 1 2]
+ [3 4 5]]
+
+Modified view v:
+[[99  1  2]
+ [ 3  4  5]]
+
+Original arr after modifying v (shares memory):
+[[99  1  2]
+ [ 3  4  5]]
+```
+
+This demonstrates that modifying `v` also modifies `arr`, because `v` is a view into the same buffer.
+
+## Codebyte Example
+
+In this example, the array’s underlying bytes are reinterpreted with a different data type using `.view(dtype=...)` without copying the data:
+
+```codebyte/python
+import numpy as np
+
+# 1) Shallow view sharing memory
+arr = np.arange(6, dtype=np.int64).reshape(2, 3)
+v = arr.view()
+v[0, 0] = -1
+print('arr after modifying view v:', arr, sep='\n')
+
+# 2) Reinterpreting bytes with a different dtype
+a = np.array([1, 256], dtype=np.int16)
+b = a.view(np.uint8)
+print('\nOriginal a:', a, a.dtype)
+print('Byte-wise view b:', b, b.dtype)
+
+# 3) Creating an ndarray subclass using type
+mat = arr.view(type=np.matrix)
+print('\nMatrix view (type=np.matrix):', mat, type(mat))
+
+# 4) Independent copy
+c = arr.copy()
+c[0, 0] = 555
+print('\nOriginal arr after modifying copy c:', arr, sep='\n')
+print('Copy c:', c, sep='\n')
+```
+
+The codebyte shows three common uses of `.view()`:
+
+- Creating a shallow view that shares memory (fast, no copy),
+- Reinterpreting the raw bytes using a different `dtype`, and
+- Creating a different array _type_ by passing the `type` argument.