How To Install python-lmfit-doc on Ubuntu 18.04
Introduction
In this tutorial we learn how to install python-lmfit-doc on Ubuntu 18.04.
What is python-lmfit-doc
python-lmfit-doc is:
The lmfit Python package provides a simple, flexible interface to non-linear optimization or curve fitting problems. The package extends the optimization capabilities of scipy.optimize by replacing floating pointing values for the variables to be optimized with Parameter objects. These Parameters can be fixed or varied, have upper and/or lower bounds placed on its value, or written as an algebraic expression of other Parameters.
The principal advantage of using Parameters instead of simple variables is that the objective function does not have to be rewritten to reflect every change of what is varied in the fit, or what relationships or constraints are placed on the Parameters. This means a scientific programmer can write a general model that encapsulates the phenomenon to be optimized, and then allow user of that model to change what is varied and fixed, what range of values is acceptable for Parameters, and what constraints are placed on the model. The ease with which the model can be changed also allows one to easily test the significance of certain Parameters in a fitting model.
The lmfit package allows a choice of several optimization methods available from scipy.optimize. The default, and by far best tested optimization method used is the Levenberg-Marquardt algorithm from from MINPACK-1 as implemented in scipy.optimize.leastsq. This method is by far the most tested and best support method in lmfit, and much of this document assumes this algorithm is used unless explicitly stated. An important point for many scientific analysis is that this is only method that automatically estimates uncertainties and correlations between fitted variables from the covariance matrix calculated during the fit.
A few other optimization routines are also supported, including Nelder-Mead simplex downhill, Powell’s method, COBYLA, Sequential Least Squares methods as implemented in scipy.optimize.fmin, and several others from scipy.optimize. In their native form, some of these methods setting allow upper or lower bounds on parameter variables, or adding constraints on fitted variables. By using Parameter objects, lmfit allows bounds and constraints for all of these methods, and makes it easy to swap between methods without hanging the objective function or set of Parameters.
Finally, because the approach derived from MINPACK-1 usin the covariance matrix to determine uncertainties is sometimes questioned (and sometimes rightly so), lmfit supports methods to do a brute force search of the confidence intervals and correlations for sets of parameters.
This is the common documentation package.
There are three methods to install python-lmfit-doc on Ubuntu 18.04. We can use apt-get, apt and aptitude. In the following sections we will describe each method. You can choose one of them.
Install python-lmfit-doc Using apt-get
Update apt database with apt-get using the following command.
sudo apt-get update
After updating apt database, We can install python-lmfit-doc using apt-get by running the following command:
sudo apt-get -y install python-lmfit-doc
Install python-lmfit-doc Using apt
Update apt database with apt using the following command.
sudo apt update
After updating apt database, We can install python-lmfit-doc using apt by running the following command:
sudo apt -y install python-lmfit-doc
Install python-lmfit-doc Using aptitude
If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude using the following command.
sudo aptitude update
After updating apt database, We can install python-lmfit-doc using aptitude by running the following command:
sudo aptitude -y install python-lmfit-doc
How To Uninstall python-lmfit-doc on Ubuntu 18.04
To uninstall only the python-lmfit-doc package we can use the following command:
sudo apt-get remove python-lmfit-doc
Uninstall python-lmfit-doc And Its Dependencies
To uninstall python-lmfit-doc and its dependencies that are no longer needed by Ubuntu 18.04, we can use the command below:
sudo apt-get -y autoremove python-lmfit-doc
Remove python-lmfit-doc Configurations and Data
To remove python-lmfit-doc configuration and data from Ubuntu 18.04 we can use the following command:
sudo apt-get -y purge python-lmfit-doc
Remove python-lmfit-doc configuration, data, and all of its dependencies
We can use the following command to remove python-lmfit-doc configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge python-lmfit-doc
References
Summary
In this tutorial we learn how to install python-lmfit-doc package on Ubuntu 18.04 using different package management tools: apt, apt-get and aptitude.
