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Several routines are available in NumPy package for manipulation of elements in ndarray object. They can be classified into the following types −
Changing Shape
| Sr.No. | Shape & Description |
|---|---|
| 1 | reshape
Gives a new shape to an array without changing its data |
| 2 | flat
A 1-D iterator over the array |
| 3 | flatten
Returns a copy of the array collapsed into one dimension |
| 4 | ravel
Returns a contiguous flattened array |
Transpose Operations
| Sr.No. | Operation & Description |
|---|---|
| 1 | transpose
Permutes the dimensions of an array |
| 2 | ndarray.T
Same as self.transpose() |
| 3 | rollaxis
Rolls the specified axis backwards |
| 4 | swapaxes
Interchanges the two axes of an array |
Changing Dimensions
| Sr.No. | Dimension & Description |
|---|---|
| 1 | broadcast
Produces an object that mimics broadcasting |
| 2 | broadcast_to
Broadcasts an array to a new shape |
| 3 | expand_dims
Expands the shape of an array |
| 4 | squeeze
Removes single-dimensional entries from the shape of an array |
Joining Arrays
| Sr.No. | Array & Description |
|---|---|
| 1 | concatenate
Joins a sequence of arrays along an existing axis |
| 2 | stack
Joins a sequence of arrays along a new axis |
| 3 | hstack
Stacks arrays in sequence horizontally (column wise) |
| 4 | vstack
Stacks arrays in sequence vertically (row wise) |
Splitting Arrays
| Sr.No. | Array & Description |
|---|---|
| 1 | split
Splits an array into multiple sub-arrays |
| 2 | hsplit
Splits an array into multiple sub-arrays horizontally (column-wise) |
| 3 | vsplit
Splits an array into multiple sub-arrays vertically (row-wise) |
Adding / Removing Elements
| Sr.No. | Element & Description |
|---|---|
| 1 | resize
Returns a new array with the specified shape |
| 2 | append
Appends the values to the end of an array |
| 3 | insert
Inserts the values along the given axis before the given indices |
| 4 | delete
Returns a new array with sub-arrays along an axis deleted |
| 5 | unique
Finds the unique elements of an array |
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