# ellipsoid_fit_python

**Repository Path**: fwatch/ellipsoid_fit_python

## Basic Information

- **Project Name**: ellipsoid_fit_python
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 1
- **Forks**: 0
- **Created**: 2021-02-05
- **Last Updated**: 2022-01-04

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# Ellipsoid fit python
Find ellipsoid fit for arbitrary data with python/numpy, plot it or write to file.
(Should work on both python 2.7 and python 3)

![Plot example](demo_screenshot.png)

Used for 3-axis magnetometer calibration.

If you want to fit an ellipse into arbitrary data take a look at issue #11 - I tried to explain how to maybe do it. Also look through other opened issues. 

Project is a port of matlab/octave http://www.mathworks.com/matlabcentral/fileexchange/24693-ellipsoid-fit to python/numpy
with some data regularization and fancy plotting on matplotlib added. It utilizes minimum squares method.
Some code for plotting taken from https://github.com/minillinim/ellipsoid

Example input file is mag_out.txt and consists of rows with 3 numbers representing point coordinates.

Use plot_ellipsoid.py to see input data, fitted ellipsoid and data transferred onto sphere surface.

Use get_calibration_ellipsoid.py to generate magcal_ellipsoid.txt where first row has coordinates of fitted ellipsoid center, and other
three rows are ellipsoid axes.

Requirements are:
- numpy
- matplotlib for plotting

Update: for close version to Matlab look here 
https://github.com/marksemple/pyEllipsoid_Fit

Update 2: Matplotlib from version 3 does not support equal axis, so spere plot may appear as not a sphere. If you still want a sphere remain a sphere on a plot, look into issue #10 (basically downgrade matplotlib and uncomment 3 lines at plot_ellipsoid.py).