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# NumPy | ones method

schedule Aug 12, 2023
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Numpy's `ones(~)` method returns a Numpy array filled with ones.

# Parameters

1. `shape` | `int` or `tuple` of `int`

The desired shape of the resulting array. If an int is provided, then a 1D array is returned.

2. `dtype` | `string` or `type` | `optional`

The desired data type of the returned identity matrix. By default, `dtype=Float64`.

# Return value

A Numpy array filled with ones.

# Examples

## Creating a 1D array

To create a 1D array of size 3 filled with zeros:

``` np.ones(3) array([1., 1., 1.]) ```

To create an 1D array of ones with type `int64`:

``` np.ones(3, dtype="int64") array([1, 1, 1]) ```

## Creating a 2D array

To create a 2 by 3 two-dimensional array:

``` np.ones((2,3)) array([[1., 1., 1.], [1., 1., 1.]]) ```

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