Learning Numpy - Simple Tutorial For Beginners - NumPy - Array Manipulation Part 12¶
Several routines are available in NumPy package for manipulation of elements in ndarray object. They can be classified into the following types −
Changing Shape¶
| Parameter | Description |
|---|---|
| reshape | Gives a new shape to an array without changing its data |
| flat | A 1-D iterator over the array |
| flatten | Returns a copy of the array collapsed into one dimension |
| ravel | Returns a contiguous flattened array |
Transpose Operations¶
| Parameter | Description |
|---|---|
| transpose | Permutes the dimensions of an array |
| ndarray.T | Same as self.transpose() |
| rollaxis | Rolls the specified axis backwards |
| swapaxes | Interchanges the two axes of an array |
Changing Dimensions¶
| Parameter | Description |
|---|---|
| broadcast | Produces an object that mimics broadcasting |
| broadcast_to | Broadcasts an array to a new shape |
| expand_dims | Expands the shape of an array |
| squeeze | Removes single-dimensional entries from the shape of an array |
Joining Arrays¶
| Parameter | Description |
|---|---|
| concatenate | Joins a sequence of arrays along an existing axis |
| stack | Joins a sequence of arrays along a new axis |
| hstack | Stacks arrays in sequence horizontally (column wise) |
| vstack | Stacks arrays in sequence vertically (row wise) |
Splitting Arrays¶
| Parameter | Description |
|---|---|
| concatenate | Joins a sequence of arrays along an existing axis |
| stack | Joins a sequence of arrays along a new axis |
| hstack | Stacks arrays in sequence horizontally (column wise) |
| vstack | Stacks arrays in sequence vertically (row wise) |
Adding / Removing Elements¶
| Parameter | Description |
|---|---|
| resize | Returns a new array with the specified shape |
| append | Appends the values to the end of an array |
| insert | Inserts the values along the given axis before the given indices |
| delete | Returns a new array with sub-arrays along an axis deleted |
| unique | Finds the unique elements of an array |
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