### Install PPIGRF from source

Source: https://pypi.org/project/ppigrf/2.1.0

Clone the repository and install the PPIGRF library by running the setup script.

```bash
python setup.py install

```

--------------------------------

### Install PPIGRF using pip

Source: https://pypi.org/project/ppigrf/2.1.0

Install the PPIGRF library using pip. Ensure Numpy and Pandas are installed as dependencies.

```bash
pip install ppigrf

```

--------------------------------

### Install pytest

Source: https://pypi.org/project/ppigrf/2.1.0

Install the pytest testing framework using pip. This is a prerequisite for running the tests.

```bash
pip install pytest

```

--------------------------------

### Import PPIGRF library

Source: https://pypi.org/project/ppigrf/2.1.0

Import the PPIGRF library into your Python project after installation.

```python
import ppigrf

```

--------------------------------

### Run ppigrf tests

Source: https://pypi.org/project/ppigrf/2.1.0

Execute the installed ppigrf package's tests using the pytest command. The -v flag provides verbose output.

```bash
pytest -v

```

--------------------------------

### Import PPIGRF library

Source: https://pypi.org/project/ppigrf

Import the PPIGRF library into your Python project.

```python
import ppigrf
```

--------------------------------

### Calculate IGRF on a Grid with Multiple Dates

Source: https://pypi.org/project/ppigrf/2.1.0

Calculate IGRF values on a grid using multiple longitude and latitude points, and a list of dates. The output shape will broadcast according to the input coordinate shapes and the number of dates. Requires NumPy for array creation.

```python
import numpy as np
from datetime import datetime

lon = np.array([20, 120, 220])
lat = np.array([[60, 60, 60], [-60, -60, -60]])
h   = 0
dates = [datetime(y, 1, 1) for y in np.arange(1960, 2021, 20)]
Be, Bn, Bu = ppigrf.igrf(lon, lat, h, dates)

```

--------------------------------

### Calculate IGRF with Geodetic Coordinates

Source: https://pypi.org/project/ppigrf/2.1.0

Calculate the Earth's magnetic field components (east, north, up) using geodetic coordinates and a specific date. Ensure the `datetime` object is imported.

```python
from datetime import datetime
lon = 5.32415  # degrees east
lat = 60.39299 # degrees north
h   = 0        # kilometers above sea level
date = datetime(2021, 3, 28)

Be, Bn, Bu = ppigrf.igrf(lon, lat, h, date) # returns east, north, up

```

--------------------------------

### Calculate IGRF with geodetic coordinates

Source: https://pypi.org/project/ppigrf

Calculate IGRF model values using geodetic coordinates (longitude, latitude, height) and a datetime object. Returns east, north, and up components.

```python
from datetime import datetime
lon = 5.32415  # degrees east
lat = 60.39299 # degrees north
h   = 0        # kilometers above sea level
date = datetime(2021, 3, 28)

Be, Bn, Bu = ppigrf.igrf(lon, lat, h, date) # returns east, north, up
```

--------------------------------

### Calculate IGRF with geocentric coordinates

Source: https://pypi.org/project/ppigrf

Calculate IGRF model values using geocentric coordinates (radius, colatitude, longitude) and a datetime object. Returns radial, south, and east components.

```python
r     = 6500 # kilometers from center of Earht
theta = 30   # colatitude in degrees
phi   = 4    # degrees east (same as lon)

Br, Btheta, Bphi = ppigrf.igrf_gc(r, theta, phi, date) # returns radial, south, east
```

--------------------------------

### Calculate IGRF with Geocentric Coordinates

Source: https://pypi.org/project/ppigrf/2.1.0

Calculate the Earth's magnetic field components (radial, south, east) using geocentric coordinates and a specific date. Ensure the `datetime` object is imported.

```python
r     = 6500 # kilometers from center of Earht
theta = 30   # colatitude in degrees
phi   = 4    # degrees east (same as lon)

Br, Btheta, Bphi = ppigrf.igrf_gc(r, theta, phi, date) # returns radial, south, east

```

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