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# NumPy | geomspace method

schedule Aug 12, 2023
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Numpy's `geomspace(~)` method creates a Numpy array with values that follow a geometric sequence.

# Parameters

1. `start` | `number`

The starting value of the Numpy array.

2. `stop` | `number`

The ending value of the Numpy array. This is inclusive.

3. `num` | `int` | `optional`

The number of samples you want to generate. By default, `num=50`.

4. `endpoint` | `boolean` | `optional`

If set to `True`, then stop will be the last value of the Numpy array. By default, `endpoint=False`.

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

The desired data type for the Numpy array. This overrides the default behavior of using the same data-type as the source array.

# Return value

A Numpy array with values that follow a geometric sequence.

# Examples

## Basic usage

Starting from a value of 1, and ending with a value of 64, create a Numpy array that follows a geometric sequence with 4 numbers:

``` np.geomspace(1, 64, num=4) # By default, num=50 array([ 1., 4., 16., 64.]) ```

Notice how the end value (i.e. the second parameter) is inclusive.

Here, the common ratio is 4, so the numbers in the array are generated like so:

``` 1 * 4 = 44 * 4 = 1616 * 4 = 64 ```

## Excluding the endpoint

We set `endpoint=False`, like follows:

``` np.geomspace(1, 64, 4, endpoint=False) array([ 1. , 2.82842712, 8. , 22.627417 ]) ```

## Explicit typing

We set `dtype=float` to obtain a Numpy array of type float.

``` np.geomspace(1, 64, 4, dtype=float) array([ 1. , 2.82842712, 8. , 22.627417 ]) ```
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